Having thought about this for awhile I still don't get it...
Doesn't a retrofocus design and the goal of what Olympus wanted to
achieve imply that the light striking the CCD is closer to perpendicular
and therefore the light as it leaves the lens will be closer to the
axis ---> smaller diameter lens mount?
Looking at this from another viewpoint doesn't a RF 35mm such as Lei*a
have smaller lenses with smaller diameter than typical for retrofocus
SLR designs?
-jeff
----- Original Message -----
From: "Moose" <olymoose@xxxxxxxxxxxxx>
Subject: Re: [OM] Some info on the new E-1
>
> "In this case, what's telecentric is the CCD side of the lens, and
what
> it means is that the rays (converging cones of light actually) coming
> from the back of the lens are always perpendicular to the CCD surface.
> This requires that the back aperture of the lens be a good bit larger
> than the CCD surface. The reason it has to be larger is that an wide
> apertures (low f-stops), the cones of light are very fat, so the lens
> back must be somewhat larger than the CCD to get full illumination out
> to the edges of the CCD."
>
> Moose
>
< 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 >
|