Sunday Rant: Hubris.

Promotional images for the play, August Osage County.  Zach Scott Theatre.

It always happens this way.  I talk all about technique and miracle lenses and I start believing that I'm as smart and talented as I've led myself to believe I am.  And so the universe comes back around and kicks my butt.  I'm fifty-five.  I haul my reading glasses around with me all the time and I should be wearing the bifocals I own but I usually can't be bothered.  Today I went to photograph a famous playwright under available light in a dark theater.  I'll blog about the shoot another time but for right now it's all about my own hubris.

I packed a quick bag of stuff.  I was intent on using my Zeiss lenses on a 7D and a 5Dmk2.  I was so confident that I'd be able to make the combinations work even though the subject has dark skin and the theater I was shooting in was dimly lit and had black walls.  I brought along a pair of reading glasses so I could review images.  And it's a good thing I did because my rate of keepers was dismally low.  I just haven't practiced manual focus enough to make the 50 and 35mm lenses sing sharp in dim light.  The 85mm was relatively easier.  The other two?  Like pulling teeth.  

I could have packed a 35mm f2  AF lens and a 50mm AF lens.  I have them both in the drawer.  But I was out to prove (with a swagger) how superior the vaunted Zeiss glass could be.  What an asshole.

Now I had the distinct (dis)pleasure of throwing out about a third of my shoot to technical issues.  Oh hell, there were no technical issues.  I just couldn't hit focus reliably today.  Even with the cool screens I put in the cameras.  Didn't I test them?  Sure I did.  I walked all over downtown Austin in bright sunlight over the course of a few weeks and startled myself with the biting sharp results.  But that's not the same as trying to focus in dark, flat light, with a moving subject while handholding the camera.  Now I've embarrassed myself.  And I wasn't going to tell anyone because I shot lots of frames and I have good coverage for what my client needs, but I thought I would come clean to remind people that good technique takes unyielding practice and that sometimes the best tool for the job at hand isn't the most impressive tool but simply the one that will do the job best.

And while we're at it we might as well kick around a few mortality issues.  I had perfect vision right up to the age of 42.  I mean I could count the feathers on an eagle flying a mile above me with the sun right behind him and I could read 2 point typed from inches away.  Then, like nearly everyone else, my eyesight changed.  I compensated.  But there finally came one of those embarrassing moments that finally pushed me to the eye doctor with my tail between my legs.  

It was the mid-1990's.  Business for photographers was booming.  We were buying 5 series BMW's and dropping cash on big Hasselblad systems. We just couldn't miss.  I ordered a brand new Hasselblad 203F with the 110 f2 Planar, the 150mm f2 Sonnar and the 50mm f2.8 Distagon.  What a gorgeous package.  The 203F had a focal plane shutter which meant medium format with fast lenses and a top shutter speed of 1/2000th.  Very revolutionary compared to the Hasselblad V series cameras.  And pricey.

I took the camera along on a shoot at Motorola.  It should have been a piece of cake.  I was photographing a group, lit with flash, sitting in two rows in front of a canvas backdrop.  But no matter how I turned the focus ring I couldn't get a good, sharp image on the screen.  I finally called over my assistant and she focused the camera and swore it was in.  We did a Polaroid and it was good.  So we shot and moved on.  But I was convinced that the fault lay with the camera and lens.  I boxed up the camera and the offending lens and sent it off to Hasselblad for evaluation.....along with a spitty letter.

About ten days later I got a call from a person with a Scandinavian accent.  The conversation went something like this:

Them:  "Mr. Tuck, I have your Hasselblad camera here in front of my and we have thoroughly tested both the body and the lens.  They are perfectly calibrated."

Me:  "Well, what was wrong with them when you got them.  What did you have to calibrate?"

Them:  "Oh no, Mr. Tuck.  You misunderstand.  We got the package and your letter and immediately sent them to the lab for testing.  We didn't have to make any repairs or adjustments.  Both were perfect right from the box."

Me: (fueled with hubris):  "That's impossible.  I know what I saw.  I couldn't get the finder into sharp focus!"  (Anger and frustration amply present in my voice....).

Them: "Forgive me Mr. Tuck but I must ask,  how old are you?"

Me:  "I'm forty two."

Them:  "And may I ask when you last paid a visit to your oculist?  (pause) Your eye doctor?"

Me:  "I never go.  I have perfect vision...."

Them:  "You did, Mr. Tuck.....but now.....?"

They kindly sent me the camera and lens back and I did go to see the "oculist" and was fitted for a pair of reading glasses.  The doctor recommended bifocals but I scoffed.  Two weeks later I went back and got the bifocals as well.  The camera worked fine right up until I exchanged it for a digital camera, years later.

The moral of the story is not that you shouldn't use manual focus cameras.  Or that you shouldn't try to keep pushing the envelope.  I guess the moral is that we all age and we all change and while it's tough to admit some things get harder.  And you have to practice more than the young and the spry. 

The thing that gets in the way is.....hubris.  En garde. 

Up early for a swim meet. The light was sweet.

I was up early today for the second swim meet of the Summer League season.  We got to the Lost Creek Country Club around 7:30am so Ben could swim, I could shoot and Belinda could spectate.  I carried my new favorite sports gear, the Canon 1Dmk2's and a 70-200L plus a Tamron 11-18mm wide angle zoom lens.  The pace is slower than assignment work and I had the luxury of shooting raw and playing around. I kept seeing great shots of the kids so that's what I concentrated on.

The kids are pretty blase about the swim meets.  The little ones can be apprehensive but by the time they hit their third year on the team they know what's expected and how to do the process.  I like photographing them as they are waiting for their events.  They are cheering on their teammates and getting ready to perform.  In our country club league all of the parents are required to volunteer for four or five meets, depending on the job.  Some are age group parents who round up the kids and get them to the ready bench on time for their events.  Some are timers, some run concessions and some are stroke judges.

Quite a number of the parents are good photographers.  One guy had a Fuji X-100 at the last meet (a week ago) but today he showed up with a Sony Nex-5 and an adapter Cosina/Voightlander lens.  Others sport Nikon D3s's with the requisite fast zooms.  It's amazing that most families arrive in force.  No drop offs.  Two parents with every family.  And they cheer in a nice way and are respectful of the process and of the opposing team.  The kids who live in Lost Creek and the kids who living in Westlake Hills and Rollingwood go to the same high school and are hardly hated rivals.  They just have parents who belong to different clubs.

Been alternating between the 200mm focal length on the 70-200mm and the 15mm focal length on the Tamron 11-18mm.  And it's two ends of the spectrum.  Love the perspective distortion on the wide guy.  Love the limited depth of field on the long guy.  Not really doing much this week with anything in between.  I imagine that means I'll be using the 35mm on the 1dmk2 for most of next week......

This is Ben with his group of guys behind him and to the left.  He's the shortest one of the bunch and the fastest in everything but the backstroke.  As you can see, hostess Twinkies, Big Macs and a steady stream of soft drinks are not on his diet.  When he's not swimming he's running cross country.  Today he won four firsts and one second.  Good job, Ben.

Love the ready bench at the Lost Creek pool.  It's a great way to keep the kids organized and the covering over the top means I usually have soft, indirect light to shoot with.  The 11-18 is working out for me on the 1.3x cropped 1D series cameras.  I just have to make sure not to zoom all the way out to 11mm.  When I do that it starts to vignette.  Not that I mind too much.....  In the core area it's tack sharp.

The girls are sweet and don't mind posing.  With the wide angle zoom it's no work at all.  Now the boys on the other hand can be.......kinetic and love to flash hand signs.  They also don't stand as close together as the girls....

I grew up swimming in the Summers on one team or another but we never had photographers there and if we had they never would have burned film on the group shots of little kids.  Maybe they'd shoot a few frames of the overall high point winner or a record setting relay team but never just random shots.  Remember, back then photographers had financial skin in the game.  Today I shot 1200 images.  That's the equivalent of 34 rolls of 36 exposure film.  Figure a cost of about $25 per roll with processing and before you could do anything at all with your slides you'd have already spent about $825.  Factor for inflation from the 1970's and it's probably close to $1500.  The easiest way to share back then would have been to find a space, set up a projector and invite the 140 families for a viewing.  Once.

Now we've just about got all of these edited from this morning and we'll upload them to Smugmug.  At some point I'll upload them into iPhoto and let the face recognition software do it's magic.  Then we can separate them by person and make sure we have representation for each kid on the team for the end of the year slide show.  We'll put that on DVD and sell it to the parents as a fund raiser for the schools.

Parents can go to Smugmug after each meet and see photos of their kids.  They can buy downloads if they want for themselves or prints to send to family and friends.  The whole process is, of course, automated. 

It's a fun way to spend a Saturday morning.  But I don't recommend it if you don't have a kid in the program.  You'll definitely be seen as an outsider.

Nuts and bolts:  There are basic ground rules that I observe.  1.  Going along with my essay on tacit approval, any kid that demures is not shot.  If I shot them and I feel that they don't want to be photographed I hit the erase button.  2.  I carry two cameras.  I leave all the silly crap like extra batteries, silly, puffy camera bags, tripods, flashes, light stands, vests and gimmicks in the car.  I use the kind of straps that God intended; never militaristic bandolier straps that hook into my camera's tripod sockets.  The big black straps convey the wrong image.  Over  the shoulder straps without logos are much less intimidating.....  3.  I yield to race officials and starters.  I never walk in front of an official or stake out territory that puts me in the path of a stroke judge.  I constantly look over my shoulder to make sure I'm not blocking swimmers, judges or coaches.  The swim race comes first, the kids come first, the photography is a distant third place.  We're doing these swim meets for the kids, not my portfolios.

4.  I never sell services or prints while I'm doing my volunteer job.  It's wrong to sell to a captive audience.  If you do good work people will come and find you on their own time.  5.  I never diss another shooter's gear.  Since I often show up with "charming" older cameras like Sony R1's or Olympus EPL's with Zeiss lenses bolted onto the front I wouldn't want anyone to be judging me.  6.  I never let my picture taking get in the way of watching every one of Ben's races.  Sometimes I'll hand the camera to someone else, ask them to shoot that race, so I can concentrate on the actual experience.  

7.  I try to only shoot respectful shots.  If some ogre of a parent is verbally abusing their child for "not kicking harder"  I walk on by.  If kids are crying or upset I walk on by.  The rule in this kind of photography, at least where I'm concerned, is to only capture images that people would be happy to see later on.  That includes the kids as well as the parents.  Might be funny to see a kid mess up and swim the wrong direction but it's not funny to the kid....  8.  The days of the photographer being a "big deal" on the deck are over.  Now we share the deck with parent photographers and other kids.  My attitude now is that I'm just another dad shooting photos.  I just happen to be covering each meet for all the moms and dads who are too busy volunteering to do photographs of their own kids as well........

Here's an important point:  The kids splash when they dive in.  Your cameras will get wet.  You can be a baby about it and make everyone around you wish you'd go home or you can just get used to it and embrace the idea that you're standing next to several hundred thousand gallons of water and chances are you'll have the opportunity to meet some of that water personally.  If you don't like the risk or your cameras are too "precious" leave them at home and enjoy the competition.

Finally,  I'm there for the fun.  When I get tired or I've shot enough I sit down in the bleachers and cheer like everyone else.  If you are driven to prove something you shouldn't show up.  If you are there for fun then welcome to chlorine heaven.  There's always room for one more respectful photographer on the deck.

Sigma, Cindy Sherman and pricing models.....

I read, with great amusement, the announcement of Sigma's newest DSLR camera, the SD-1.

It looks like a very well designed digital camera body.  They claim that the body is carved out of magnesium and is weather sealed.  It will bang out 44 megapixel files at five frames per second.  It will take a full line of Sigma SD lenses.  It has a three inch, 460,000 LCD on the back.  I like the little strap lugs.  But the aspect of the announcement that brought a smile to my face was the revelation of the MSRP.  The price of this camera, sans lens, is just under $10,000.  The rationalization (and I think this is such a far stretch that it could only have been thought up after a long evening of heavy, heavy drinking...) is that the three layers of APS-C sized sensors each record pure color for each of the RGB colors instead of using a Bayer Filter with Interpolation for digital capture.  This also does away with the need for an anti-aliasing filter which, in theory, should make the files sharper.  When you do the math this way (3x15 megapixels = 45 megapixels) you can say that your camera captures the same size image files as the Medium Format digital cameras on the market.  Indeed, if this camera made images just like a 40 megapixel Phase One back it might  be worth less than half the price of the Phase One.

But all things are not equal.  While photographers like the high res files provided by MF cameras they also like and use the depth of field effects provided by a large sensor.  And the Phase One sensors are nearly four times the size of the SD-1 sensor.  Another benefit of bigger sensor wells spread over a larger surface area is that lenses don't have to be designed to ultra high tolerances in order to deliver the goods to the sensor as a whole.  To get the same system resolution in the SD-1 that you'd get with a big Phase One sensor you'd need lenses that were computed and manufacturer to be at least four time higher resolution.  Much better corrected for CA and other issues and you'd need much tighter tolerances because all geometric physical deviations would be amplified by a factor of at least 4.  (Quick.  Some engineer check my work here.....).

I've used Sigma lenses.  Some of them are good.  None of them are good enough to make use of the implied resolution of this sensor system.  Maybe a few of the Zeiss lenses.  Perhaps the M series Leica lenses (which would not work on this camera) but not the typcial 18-250mm zooms.  So, what were they thinking?  Will we ever know?

Here's a scary thought for all of us nay-sayers:  What if it really does what it says and we have so much gear hubris that we can't let ourselves believe it?  Naw.  Size is size.  But you have to admire their courage for putting it on the market this way.  Now when they drop the price to $4900 it will almost seem like a bargain....

So, ten thousand dollars for an APS-C camera body.  Now I think we have a real handle on just how bad inflation really is in America. ( proffered as a joke...).

With that in mind let me move on to the other interesting news of the week:  The world's highest priced photograph.  A Cindy Sherman self portrait (mise en scene) sold at auction in New York for $3.9 million.  Everyone on the web is outraged.  The "pro" forum on DPreview is bristling with "photographers" who are frothing at the mouth and exclaiming that "no photograph is worth that much money!!!!"  Even normally open minded Mike Johnston at the Online Photographer opined that the pricing was probably the result of ridiculous pissing match on the part of two collectors with too much money on their hands.

I'll take the opposite side.  I think Cindy Sherman's work represented the vanguard of work that pried open the museum market and made collectors and curators consider photography as a real and bonafide part of the art world and all that entails.  The spoils go to the pioneers.  Just as Steve Jobs and Apple reap the benefit of being first and best in the tablet market (and make billions!!!!) Cindy Sherman was part of the first wave of photographer/artists whose photos were about an idea, a manifesto, a dogma, a thought instead of being purely representative.  With Cindy Sherman, Sandy Skoglund, and a handful of others it became okay to make art about a thought instead of about a thing.  And this opened the door to current masters of the large inkjet prints who, incidentally, are getting up to half a million dollars a print for large works.  And those works haven't withstood the tests of time, nor are they revolutionary in the same sense as their predecessors of thirty years ago.

Why is a Rembrandt worth one hundred million dollars?  Why is a Van Gogh worth forty million dollars?  Why are Leonardo da Vinci paintings priceless?  In a sense, it's because they represented a giant tectonic shift in art which reflected a related shift in culture and society.  They are a visual artifact of our collective evolution.  They are our monolith on the moon in the movie,  2001 A Space Odyssey.  These works are the signposts of change in our civilizations.  That's why they are prized.  They are prized as ideas not as paper talismans.  And the world market now sets their price.  Can you really argue with the power of ideas?  Isn't that what drives corporations from Xerox to Apple to Google?

The idea moves all people forward.  How to put a price on that?

So.....back to work.  I'll need to sell a lot of photographs and videos if I'm going to get on that long list for the SD-1, let alone my own copy of a Cindy Sherman.

One last thought.  It's not important that we all own a Cindy Sherman but it is important for art in general and photography in particular that our culture is still able to celebrate expression and art as having value.  That's the real meaning of the auctioned Cindy Sherman photo.  Now just think how much more it would have gone for if she'd made it really, really big.......

A visual repudiation that "Strobism" and off camera flash were invented in 2006.

Love David Hobby.  Love his whole crazy bus thing.  But some of his followers have become rabidly zealous.  I just had a conversation with a follower who swears that David invented the whole idea of "off camera flash" and that the popularity of flash photography owes it's birth and subsequent burst into flame because of the Strobist blog.


Well......I have to differ with that.  And I scrounged up this image of moi (taken by Alan Pogue) as proof that we were slamming around photons off the camera for at least a couple decades before.  In fact, I'm going to bet that this photo,  showing a Canon EF film camera actually dates from the very  early 1980's.  What we have in this picture is Kirk Tuck in his twenties, a Canon EF with a 50mm lens and a six foot coiled cord connecting the camera to a Braun flash.  Sorry, I can't remember the model.


I was at the Sheraton hotel for the election night party with the then (obscure) Texas Republicans.  They lost.  Badly.  Really badly.  I am absolutely certain of one thing.......I was using hand rolled Kodak Tri-X film.


Off camera?  We didn't even have a name for it.  That's just the way we rolled back then.  We could figure out manual guide numbers faster than kids can text on an iphone.  And no screen on the back for a crutch.  I'll say it.  Photographers today are wimps when it comes to using flash.  Just wimps.  Turn that screen off and shoot some manual "off camera" flash.  It's not nearly as hard as everyone makes it out to be......  Did I mentioned that we were also able to focus our own cameras simultaneously with our guide number calculations?  Amazing.

Did they invent photography just so we could photograph our kids?

I already had a big octabank set up, along with a small softbox for a hair light.  I'd done a portrait earlier in the day of a new executive at one of the transportation agencies I work with.  At dinner Ben asked me if I had a recent photograph of him sitting around.  What is recent?  For me it's yesterday.  I don't know about anyone else.  I said, "no." But we could take care of that in minutes.  We walked out the front door of the house and marched the long ten steps into the front door of the intergalactic headquarters of The Visual Science Lab and proceeded to Mega Studio One.


Ben sat down on the pneumatic posing stool, turned to the camera and flashed his signature smile.  One click and we were done.  Seconds later I'd converted the file and sent it to his computer in the house.  He walked in and printed out what he needed.  It was part of an assignment for school.

I like working with Ben.  He's a pro.  He's produced about 60 video projects to date and has to direct people himself.  He now understands how important it is to get the right look in camera.  Before his last assignment for his cinema class at school he came into the studio for a quick discussion about best practices with microphone placement.  We popped open a Pelican case and he chose a mic for his project. He selected the Rode Stereo Mic.  Then he grabbed a Canon 60D with an 18-55 lens on the front, the "fishing pole" for the microphone and some cabling.  As an afterthought he also popped an LED light into his Domke bag  (yes, the kid has his own brown Domke bag....).

I was about to tell him which parameters to change in the menu but he gave me one of those looks that says,  "Thanks Dad but I had this memorized the first time I used it."

I wanted Ben to be interested in photography but he's not playing along.  His focus is film and video.  He's a freshman this year but his PSA about diabetes and peer pressure won third place overall in his school and they handed him $250 in prize money.  The judges said the production values looked like film.  The thing that made me proud is that he turned around and split the money with his crew.  When I finally grow up I want to be just like Ben.

Hand colored Summer.

Hooray! The Swim Season is Upon Us.

 I grew up in a pool.  Started swimming on a swim team in elementary school.  I lived with the wonderfully clean scent of chlorine wafting thru my nostrils twice a day from age 14 to age 22.  And I loved it.  After a long hiatus I got back into swimming in the early 1990's with a master's swim team here in Austin.  Masters swimming provides coached workouts for ex-college and high school swimmers, triathletes and just regular people who want to get into really, really good shape.  If you've done triathlons you've probably found that the people who excel and win are the ones with the best swim performances.

Our club has 14 coached workouts over the course of a typical school year week.  We have a 7am, an 8:30 to 9:30am (which I have dubbed "the executive workout" because you pretty much won't get to work until after 10 am....), a noon workout and then longer workouts on Saturday and Sunday mornings.  While most people hit a workout a day and then one of the two weekend workouts there are some "motivated" people who cram in some "two a-days".

This ain't a pokey group of seniors either.  We've got four recent gold medal winning Olympians who swim regularly, a bevy of recent NCAA All Americans (mostly from my Alma Mater, UT Austin) and, even some retired professionals from other endurance sports on the roster.

We had a fun workout this morning at the executive session.  We started with a 400 yard swim, a 300 yard pull, and then six 75 yard swim/kick combinations.  Our main set was something like this:

200 swim
8x50's on :45
200 pull
6x50's on :50 (with times descending from the first set of 50's.)
200 swim
6x50's  kick on a minute
200 swim fast
200 warm down

That's about 3200 yards.  A little short of two miles.  We plowed thru it in about an hour.  I love finishing workouts because that means I can go and get coffee and... that I made it out of the pool, alive.

I've never photographed my master's group but it seems like a project just begging to happen.

I put my son, Ben, in the water at around six months.  He joined the Rollingwood Waves Summer League team when he was five.  Of course I was there with cameras around my neck.  He's on his tenth year now.  Somewhere at the beginning of his swim career the parents on the team found out that I was a photographer.  Since every family has to do a volunteer position at five of the seven swim meets they invented the position of "official team photographer" just for me.  My real responsibility is to produce a slide show for the end of the year awards picnic.  I go to every meet and try to get good shots of every single kiddo.  Belinda is my editor and she keeps track of what goes into the slide show.  The slide show last for about 12 minutes.

I also upload images from each swim meet onto a private Smugmug gallery and the parents can order (and pay for) prints or downloads for personal display use.

I've been looking forward to this Summer's season ever since I bought the two Canon 1dmk2 cameras.  I love the way they lock in focus and I love the way they nail exposures.  My Lenmar aftermarket batteries chug right along and give me enough juice to shoot 1200 exposures in each camera, per charge.  I love the frame rate.  I love the split second response of the shutters.

Our first meet was an evening meet.  And, unusually for Austin, the temperature was in the upper 70's for most of the time.  It dropped into the 50's later in the evening.  I left the swim meet around 9pm.  Ben's events were over and the light had faded to a soft glimmer on the horizon.  I could hardly wait to get back there the next morning at 8:15 for the Saturday morning workout.

What's the benefit of shooting swim meets?  You get to work on your timing.  You get to meet your kid's friend's parents.  You get to photograph great looking kids achieving and smiling and working on goals.  It re-energizes my optimism.  The world may be falling apart but these kids will have the discipline to excel.

And what's the benefit to a photographer of actually getting in and swimming hard six days a week?  Lower blood pressure, optimum weight, better endurance for those long shoots, the discipline to work toward long term goals.  A bitching set of abs. :-)   And the ability to eat lots of food and not gain weight.  Seems like a good trade off to me.

Keep your lenses clean. Don't keep cleaning your lenses. And for God's sake don't stick a filter in front of them!!!!

See how blurry the photo got over on the left side?  That's because I had a UV filter on the front of my lens for protection and..........

Okay, not true, but..... I've experimented many times over the last few decades and I've proven to myself that filters in front of lenses degrade the quality of the final images.  Here's how I understand it all:  Every air to glass interface causes a slight loss of resolution and contrast.  This tends to make a lens look "flatter" and less sharp than it could be.  Lens designers have understood for over a century that adding more glass elements increases the compromise.  In the 1940's and 1950's they were willing to compromise things like corner sharpness and flatness of field so that they could design lenses with fewer corrective optics that had much more "snap" and "sparkle" than lenses of equivalent focal length designed with more elements.  

Everything in lens design and manufacture is a compromise.  If you add more elements you can correct for more distortions but you inevitably compromise contrast or resolution.  And contrast/resolution is an equation.  You can have one or the other or a mix but not high apparent acutance and high resolution in the same design.  Really.  Macro lenses need to have flatter fields and greater correction of geometric distortion.  They have more elements.  But in order to keep the image quality very high they have slower f-stops and smaller elements.  Smaller lens elements are easier to machine with high accuracy than larger elements.  They are easier to correctly assemble in barrels.  Faster lenses have bigger elements.  According to optics expert, Erwin Puts, every time you double the diameter of an optical glass element you increase the manufacturing complexity by something like a factor of 8X.

The creation of the "cemented pair;" two elements bonded together, is an attempt to reduce the number of air/glass interfaces to cut down on light loss and the tendency to increase "veiling flare" at each intersection.  Lens coatings are also an attempt to cut down on light lost at the interface of each element. They also prevent (by the process of wavelength interference) light from hitting the element and bouncing back to cause ghosting on the surface of the glass element thru which it just emerged.  Yikes.  A lot of design goes into making glass and coatings that nullify various wavelength "bouncebacks".  

Practically speaking, when you buy "L" glass or premium Nikon or Leica or Zeiss glass you are buying a system that's tweaked like a race car.  Really.  Like a Formula One race car.  It's optimized to produce stunning images as part of an overall optical system.

So you drop a few grand on your dream lens, put it on a tripod, lock up the mirror and trigger the shutter with an electronic cable release and.........you don't see the huge difference between the deluxe optic and the old beater you've had in the bag for years.  You know why?  To use the race car analogy you just put on aftermarket hood scoops, spoilers and fancy wheel covers on your race car when you stuck the damn filter on the front!!!  You introduced two air/glass interfaces that the lens designer didn't include in his calculations.  His computer didn't compute for them either.  You added weight and drag to your race car.  

And to make matters worse the coatings on the filter may interfere with the coatings on the lens and cancel out parts of the spectrum that you might really like to have on your imaging sensor.  They also introduce more chromatic aberrations because now the various color frequencies don't line up as well on the imaging plane.  

The idea behind the desire to use a filter is to protect the front element of the lens.  In days of old, when people would sit around on their davenports and immerse themselves in the latest novels of Nabokov and Kerouac while sipping cognac,  the coatings and the glass used on lenses was......soft.  Rigorous and frequent cleaning degraded the coatings and could scratch the front surface of the glass which led to flare and other nasty optical business.

But lenses have been hardcoated for years and years (five decades?).  And the infinitely expensive fast telephoto lenses from Nikon, Canon and Leica are designed with a neutral front element that is, essentially a built in protective filter.  The difference being that the systems were designed with that component as an integral part.  Not an after thought that's only benefit is to increase the commission of your camera sales person or to increase the margin on your internet purchase.

Finally, too many people who decide they must have the glass make the stupid decision to save money and buy cheap filters.  Back to our analogy, it's like putting retreads on a Ferrari.  You might be able to go but you won't be able to go fast.  

If you live in constant fear that your lens will become damaged you have obviously spent too much money on your lens and should return it and buy something that won't cause you unbearable emotional distress should it become damaged.  Really.  Like buying a nice car and always having to park it across three spaces because you don't want it to get door dinged.  It's karmic.  It's the quickest way to get your car "keyed."  And your fear for your lens attracts calamity to your lens like a magnet.

Stop.  Take the filters off the lenses.  Shoot like a real man.  Or a real woman.  And if your lens is destroyed then make sure you have a good story to go along with the loss.  That's the way it's done.

I've been doing this for 25 years and I've never had a front element damaged.  The protective filter is an urban legend.  It's also a huge profit add-on for the camera sellers.  My advice?  The only filter we really need in the digital days is a circular polarizer.  And that should stay in your pocket til you need it for something aesthetic.  

added after:  Here's what Lloyd Chambers, noted writer about optics, has to say about the filter imbroglio:  http://diglloyd.com/articles/Filters/quality.html

A second chance at writing a competent review of the Zeiss 21mm lens.

Several weeks ago I borrowed a 21mm Zeiss ZE lens from the local Zeiss representative.  I'd been asked by a client to shoot interiors and equipment installations at a very private and very exclusive country club somewhere in central Texas.  I own a Canon lens but I'm all too familiar with its limitations.  I wanted to make really great images for this particular client and I thought the 21 Zeiss would do it for me.  Most of the images from that shoot were really good.  In fact, the art director said she could see a difference in quality and sharpness when she looked at the small images on the back screen of the camera.  I felt that the optic was very, very sharp but it a few of the images with bright light sources (sunlit windows especially) I saw too much flare.  Far more flare than I would have gotten with the Canon lens.  I wrote a brief paragraph or so on the blog and stumbled off to work on something else.  One afternoon my friend, Paul, who is a renowned architectural photographer, called to see what I thought about the lens.  I gave him my impressions and he said, "That doesn't sound right....do you mind if I take a look at it?"  I met him for coffee and handed the lens over.

Now, if most people questioned my judgement I'd take it with a grain of salt but Paul owns and uses the newest Canon 17t/s the 24t/s a bag full of Zeiss Biogons and other wide angles and just about every exceptional optic that's ever been pressed into the service of photographing the interior and exteriors of buildings.  Is he knowledgable?  Absolutely.  Lately Paul's upped his game by buying a complete Hasselblad MF digital system.  Five or six of their best lenses and a really nifty shift adapter.

In using the lens and in comparing it with the 18mm Zeiss Paul was able to duplicate my flare results.  We met at my studio to shoot some additional comparisons.  As we were putting the lens on the front of a Canon 5dmk2 Paul put on his reading glasses and looked carefully at the front of the lens.  There were two small spots on the front element.  Could have been water marks.  Or dried spit.  Or some outer space goo.  But we're talking maybe one or two millimeters in diameter, tops.  And quite transparent.  Paul wiped out a cleaning cloth and ministered to the front element.  Minutes later we were shooting amazing tests with absolutely none of the flare I'd seen previously.  As Paul explained (and I should have known) flaws on the lens surface are magnified with wide angle lenses.  It's imperative to keep the front element cleaned.  Does that mean hanging a filter on the front?  Absolutely not......but that's fodder for another post.

My next tests were night and day.  The lens performed the way Paul and I expected it would.  By f.5.6 it was sharp and detailed and bright in a way that zoom lenses and my 20mm Canon wide angle can never match.  The distortion is well controlled and there is a profile of this lens and most of the Canon pro cameras in the Camera Raw panel in both PS CS5 and in Lightroom.  That extra nudge from the profile makes the geometry pretty much perfect.  

The lens is both heavy and slow to focus.  Slow because you'll be doing it manually and it's harder to see the in and out of focus as easily with a wider angle optic.  The discrimination between zones of sharpness is less obvious.  But the way I used this lens was to put it on a tripod and use the magnifier in Live View with the Canon body.  Many decry the addition of live view as a gimmick or a "feature" that adds extra complexity and cost to a camera but Paul and I find that, for architecture and other carefully considered uses, the Live View transforms most cameras into miniature view cameras with most of the control that implies.

If I were to use the lens for traditional (I'll take the picture without telling anyone and I'll try not to get caught) street photography I would rely on zone focusing it and depending on the wide depth of field that results.  It's not a lens you whip up to your eye and whip into focus quickly.

The summation?  It's at least two levels of magnitude better than the Canon 20mm.  It's better at 21mm than any zoom I have used.  That includes the Nikon 14-24 and the Canon 16-35L.  If I decide to add more architectural photography to my menu of services this lens would be my "go to" lens.  Will I buy one?  I think so.  Should you care if I buy one?   Probably not.  As a matter of fact the previous review points out the foible of taking people's web opinions too literally.  My first impression was a lens with flare issues.  I was ready to give the lens back.  Obviously my test procedure was flawed.  I should have checked the front element carefully when I saw the first evidence of flare.  That's a mistake I probably won't make again.

It's an incredible lens.  Made in a fashion that is quickly becoming rarer than cheap, full frame camera bodies.  It's a sharp tool.  But a very specialized one.  If you need  that focal length you need this lens.  If you love shooting with longer lenses and you don't have clients to please then it's a lot of $$$$.

That's it. Off to lunch.  Today is Chinese food at Lotus Hunan on Bee Caves Rd.  If you live in Austin please try this place.  It's wonderful and the family that runs the place is sweet as can be.  Lots of interesting specials.