You're naive. And, your curiosity is genuine.
Coating means filtering the light, not redirecting the cumulative light wave or 'beam' of light.
The sensitivity of digital cameras are so accute, the angle of the light striking that sensor is perceptable.
Hey, for 30,000 dollars US you can get a corrective lense device to make the digital Sony High Def. movie camera act like film.
S.
----- Original Message ----- From: "Roger Eichhorn" <eichhorn@xxxxxx>
To: "List for Photo/Imaging Educators - Professionals - Students" <photoforum@xxxxxxxxxxxxxxxxxxxxxx>
Sent: Sunday, January 30, 2005 8:47 PM
Subject: Re: Digital ISO; lens optimization)
I'm not sure what it all means, but Canon says "Optical coatings are optimized for use with digital cameras." This statement is specific for the "Zoom Lens EF 17-40 mm 1:4 L," that I have. The first quote is from
http://consumer.usa.canon.com/ir/controller?act=ModelDetailAct&fcategoryid=148&modelid=8940.
Are they conning us? It's a really nice lens and works perfectly with my 10D. They don't explain what they mean by "optimized." And, they don't say the lens won't work with film cameras.
As I understand all the hyperbole about image circles, as long as they are significantly larger than the image capture device, and there are no spurious reflections within the camera, there should be no problem.
Correct me if I'm naive or just plain wrong.
Roger
The requirement for the image circle is far smaller with most dSLRs because the sensor is far smaller than a 35mm frame.
At 06:41 PM 1/30/2005, SteveS wrote:The image circle falls off at the edges with digital capture, because of the accuracy of the chip and the fact that the light strikes the sensor at an angle.
Jeff Spirer Photos: http://www.spirer.com One People: http://www.onepeople.com/ Surfaces and Marks: http://www.withoutgrass.com
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