Personally I think there are a lot of unrealistic expectations about lenses for a DSLR being smaller and lighter than lenses for a 35mm film camera.
There will, of course, be some cases where the smaller sensor area allows a lens with a given focal length to be noticeably smaller, but these will be in the middle focal length range (say 28-70mm), where the size of the lens mount probably makes as much of a contribution to the physical dimensions of the lens as does the optical design. When you get out to the extremes there are other isses that will dominate. The big size benefit I see from my *ist-D is that now I can carry a 200mm/f2.8 where I used to carry a 300mm/f2.8. That makes a significant difference to the size and to the weight. On Sun, Nov 12, 2006 at 04:58:41PM -0800, Godfrey DiGiorgi wrote: > The difference in design is more than simply angle of view and image > circle. Lenses designed for a digital sensor have to work hard to > 'straighten' the light path so as to be close to orthogonal to the > sensor, something that was never an issue with film. This means a > more complex design, particularly for the ultra wide angle lenses, > which adds elements and bulk to the lens assembly. > > Godfrey > > On Nov 12, 2006, at 2:29 PM, Shel Belinkoff wrote: > > > Maybe ... I don't know. But, the Olympus Zuiko 21/2.0 was for full > > frame, > > weight but 250 grams or so, and used 55mm filters. Compare that to > > the > > A20/2.8 or even the K20/4.0. The Pentax M20/4.0 was quite a bit > > smaller > > and lighter than its predecessor. The pentax M85/2.0 is substantially > > smaller than the Leica 90/2.8 Elmarit, and the Leica Tele-Elmarit > > 2.8 is > > smaller than either. The Pentax M35/2.0 is substantially smaller > > than the > > K35/2.0. > > > > So, why couldn't a modern 14mm be a lot smaller than an earlier 15mm? > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
