It would be more important in wide angles than in telephotos... I'll let the reader draw their own conclusions.
At 09:36 AM 9/13/2002 +1000, you wrote: >On 12 Sep 2002 at 18:36, Brad Dobo wrote: > > > Can you repeat that in English? :) > >:-) > >OK. We had a discussion a while back on the PDML about the validity of >"digital" lenses. The inference was that not all conventional lenses were >"digital" compatible, yet there was nothing but vague indications of why this >could be the case. Was it just marketing hype etc. We deliberated that >possibly >of the angle of the rays hitting the sensor could be problematic in some >cases >due to the physical depth of the sensor pixels. > >This example of CCD provides real data for the assessment of sensitivity loss >vs angle if incidence :-) > >To put this in context you can assume that the ray from a telephoto lens hit >the film plane at a fairly low angle of incidence at the edges of the >frame as >the secondary principal point (SPP) is effectively a long way from the film >plain whereas a wide angle lens often has a short SPP and therefore a higher >angle of incidence. > >Given that the angle of incidence to the sensor plane does seem to affect the >light fall off as noted in the case of this sensor (which I assume is the >direction many designs are headed) the there may be a case for lenses that >are >optimised for digital applications. Oh no.... > >Cheers, > > > >Cheers, > > >Rob Studdert >HURSTVILLE AUSTRALIA >Tel +61-2-9554-4110 >UTC(GMT) +10 Hours >[EMAIL PROTECTED] >http://members.ozemail.com.au/~distudio/publications.html
