The telephotos are not. Only when you get into focal lengths that will not cover 6x7 (or whatever), do the lenses get smaller for a smaller formats.
-- graywolf http://www.graywolfphoto.com http://webpages.charter.net/graywolf "Idiot Proof" <==> "Expert Proof" ----------------------------------- Jostein Øksne wrote: > Then tell me, guys, > Why are the medium format optics so much larger for corresponding > focal lengths and max apertures? > > Jostein > > On 9/2/06, K.Takeshita <[EMAIL PROTECTED]> wrote: >> Adam Maas mykroft at mykroft.com Sat Sep 2 08:49:28 EST 2006 >> >>>> 400/4 with SSM would be neat. Can't see any good reason to make it >>>> DFA, though. DA will make it smaller, cheaper and just as good. >>>> >>>> >>>> Jostein >>>> >>> Actually, the size constraints on a 400 are all in the glass diameter >>> (for a given aperture), format is essentially irrelevant to this, at >>> least until you start talking LF, so there's zero reason to make it a DA >>> lens since it will be the same size anyways. >> Exactly. After certain size (say 200mm or so), there is no reason to make >> it a DA. >> Still some hope for FF wishers :-). >> >> Cheers, >> >> Ken >> >> >> -- >> PDML Pentax-Discuss Mail List >> PDML@pdml.net >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> > -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
