Brian Walsh <[EMAIL PROTECTED]> wrote: >Pulling on my high rubber boots, and replying to some replies to my earlier >reply (I'm in digest mode): > >"Nope. Uses the same lenses as the film N1. " > >Yes, those are the lenses I meant. I believe they were designed to allow a >nearer-to-90 degree angle of the light path to the sensor (or film, >depending on which new N model to which the new lenses are mounted) than is >required for (wide angle) lenses designed only for use with film, such the >older (though excellent) Carl Zeiss lenses for Contax.
Nope, that wasn't anything to do with the redesign of the lenses. Even if they moved the lens-flange-to-film-plane distance out a full centimeter it would have *very* little effect on the angle at which the light rays strike the film. >"Why? What would prevent these lenses from being used on a full frame >digital camera? " > >The issue raised explains it: CCD's apparently cope poorly with rays which >strike them at many angles which are fully compatible with film. Using a >smaller than full-frame CCD with conventional lenses avoids those paths >nearer the edges of the image circle which strike the recording surface at >more extreme angles. This red herring has been trotted out a lot. It's bogus. >In some ways this situation is analogous to the required redesign of >more-or-less symmetric wide angle lenses to clear the mirror box on the new >SLRs. Which is exactly why, even if your unsubstantiated hypothesis were true, they wouldn't need to redesign all the lenses for a CCD: They'd just have to come up with wide angles of a more retrofocus design. >Some of you may be interested in a white paper from Schneider, which >discusses the differences between lenses for digital and film cameras: > >http://www.schneideroptics.com/info/white_papers/optics_for_digital_photography.pdf Fascinating paper...which doesn't make ANY mention of the mythical "wide angle lenses won't work because of the angle of the light reaching the CCD" problem. And there's a good reason they don't mention it... -- Mark Roberts www.robertstech.com - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
