George Conklin wrote:
He then went on to give a curious answer as to why not. "The OM lenses do
not work for digital imaging." He said that lenses focused images by the
rays crossing and the CD chip needed all the light beams to be coming in on
a straight axis because the pixel receptors were like a cup and the light
had to reach the bottom. The present OM lenses land the images at an
angle. I said, "Hunh???" That was about all he was able to say.
The guy was fundementally correct. Most CCDs have microlenses which reject
off-axis light. My guess is that by the time the light travels from the
back to the lens to the back of an SLR body, the light is roughly
perpendicular to the CCD. This may imply that the Olympus digital SLR has a
reduced (by SLR standards) back focal distance so that this distance is
shorter. In other words, the decision not to use OM lenses was probably
made early in the design process.
Kerry Frohling
Fullerton, CA USA
_________________________________________________________________________
Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.
Share information about yourself, create your own public profile at
http://profiles.msn.com.
< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
|