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
