Bob Talbot wrote: > Your missing the point: of course it would work with film. > > Moving the rear element away from the film just means the "beam" from > the rear element would be designed to converge more slowly than > before. It would still come to focus on the same plane.
Depends on teh focal length and whether you are talking zoom. Moving the rear element most certainly does change things, including close focusing, something the newer lenses brag about. > As a direct consequence, as Jim said, the lenses would have to be > bigger / heavier. Again, not true. Explain then why the new Tamron 28-75mm F2.8 Di is smaller and lighter ans still focuses close? It uses a 67mm filter and is lighter than most too. > I'm still confused as to how the 1Ds seems to cope fine edge to edge > yet <TROLL> the poxy little sensors of amateur versions </TROLL> are > bothered by the comparatively small angular variation. > > Why didn't they make the sensors curved and be done with it ;o) Because a curve would be problematic from design of the CCD and also varying the sensor size would cause lens design problemsgreater than what we already have. Peter K * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
