They will be smaller of you compare field of view (as a 135 2.8 is much smaller than a 200mm 2.8), but if you compare with the same focal length with the same maximum aperture the front element will be the same no matter how small the sensor is.
DagT > Fra: "John Forbes" <[EMAIL PROTECTED]> > > 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 > > > > > > > > -- > Using Opera's revolutionary e-mail client: http://www.opera.com/m2/ > > > -- > 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
