That is not necessarily the case with ultra-telephoto lenses. For instance, the original 6x7 300mm f/4.0 was exactly the same lens as the K version for 35mm with a different mount, and 300mm is not exactly a UT. With UT's the size of the glass is determined by the speed desired not the format. This is true with almost all the very long lenses I am aware of. So, while maybe, slow UT's can be quite a bit smaller for a small format, those with large apertures apparently can not.
-- graywolf http://www.graywolfphoto.com http://webpages.charter.net/graywolf "Idiot Proof" <==> "Expert Proof" ----------------------------------- John Forbes wrote: > If the image circle is designed for APS-C, then the lenses will be smaller > and lighter than those designed for 35mm. So they WILL be small and > light, relatively speaking. > > But, like you, I hope they have USM. We shall know in good time. > > John > > On Fri, 18 Aug 2006 09:41:15 +0100, DagT <[EMAIL PROTECTED]> wrote: > >>> Fra: "John Forbes" <[EMAIL PROTECTED]> >>> >>> On Fri, 18 Aug 2006 10:03:00 +0100, DagT <[EMAIL PROTECTED]> wrote: >>> >>>> I'd give it a few months more to decide. If they are going to >>> introduce >>>> USM lenses it will be a logical explanation for why they have stopped >>>> producing a lot of long lenses. They may be planning to revive them >>>> with USM. >>> I'm sure they will introduce more long lenses - they can't afford not >>> to. >>> At the moment, the lens line-up is unbalanced; there is lots of stuff >>> below 50mm, and very little above 100mm. >>> >>> Whether the new long lenses will be USM or just small, light, DA >>> versions >>> remains to be seen, but if they are USM it certainly makes sense not to >>> announce them until after there is a camera body that they can work >>> with. >>> >>> I would be most surprised if there are not new 200mm, 300mm, 400mm and >>> 600mm primes within two years. And, of course, the fast zooms have >>> already been announced. >> Long lenses with larger apertures will never be small DA or D-FA wil be >> about the same. Because of this they will also have heavy focusing >> mechanisms (even if the gain some by using IF), and that is were they >> really need USM. All of the lenses they have introduced recently have >> light focussing mechanisms that can be drivenby the motor in the camera >> without any problems. This, together with the fact that som many long >> lenses have disappeared, make me believe that they are up to something. >> >> DagT >> >> > > > -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
