So how do you explain the fact that a Pentax 110 1:2.8 50mm is about 1/4 the size of a Pentax 1:2.8 50mm in K-mount?
John On Fri, 18 Aug 2006 10:35:13 +0100, DagT <[EMAIL PROTECTED]> wrote: > 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 >> > > -- 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
