75mm and 135mm leaf shutter lenses have no 'A' setting. Granted, there were still soft focus FA lenses (with no 'A' setting) in the catalog when they introduced SAFOX 8 metering. As far as I know, there are no SAFOX 8 cameras with aperture levers. The 645n does, in fact, use the same metering electronics as your MZ-3.
On 2/27/07, P. J. Alling <[EMAIL PROTECTED]> wrote: > I do, as Pentax uses as many systems across camera lines as possible to > keep costs down. The metering and auto focus electronics in the 645n > were probably, (I only say probably since I've never taken either camera > apart, though if someone would like to send me a 645n to sacrifice I'll > be happy to compare it's electronic guts to my not economically feasible > to repair MZ-3), the same modules as those in the MZ/ZX-5n. I expect > the 645D to share the autofocus electronics and metering with the K10D. > If they do that, and I have every confidence Pentax will, full aperture > metering with 67 lenses is dead as the dodo. > > Thibouille wrote: > > Ah I didn't know. That said, I don't expect Pentax to drop support for > > this in their Pro line. > > > > 2007/2/27, P. J. Alling <[EMAIL PROTECTED]>: > > > >> All 645 lenses are A lenses and are electronically identical to to the > >> Pentax Ka lens mount. There is no 645 equivalent to a K lens but I > >> would expect that the 67 lenses would fill that niche. Remember Ka > >> lenses are supported by all Pentax K DSLRs but using the aperture ring > >> for full aperture metering isn't. > >> > >> Thibouille wrote: > >> > >>> If the adapter provides the linkage then 645D should meter normally IMO. > >>> Pentax stated that 645D is compatible with all 645 lenses and the > >>> DFA55 is announced as being compatible with previous 645 bodies (and > >>> it has an aperture ring). > >>> > >>> So it should (hopefully) be OK. > >>> > >>> 2007/2/27, Mark Roberts <[EMAIL PROTECTED]>: > >>> > >>> > >>>> P. J. Alling wrote: > >>>> > >>>> > >>>> > >>>>> Mark Roberts wrote: > >>>>> > >>>>> > >>>>>> Paul Stenquist wrote: > >>>>>> > >>>>>> > >>>>>> > >>>>>>> On Feb 27, 2007, at 3:58 AM, Thibouille wrote: > >>>>>>> > >>>>>>> > >>>>>>> > >>>>>>>> Mmm BTW do 67 lenses provide mecanical coupling when > >>>>>>>> used on 645 with adaptor or one you them like M42 on K body ? > >>>>>>>> > >>>>>>>> > >>>>>>> When used on the current 645, using a 67 lens would be akin to > >>>>>>> using an M42 lens on the Pentax digitals. > >>>>>>> > >>>>>>> > >>>>>>> > >>>>>> A little better than that: The 67-645 adapter does provide > >>>>>> automatic diaphragm actuation and open aperture metering. At > >>>>>> least according to the Pentax literature. I'd love to buy one of the > >>>>>> things if I could ever find one. > >>>>>> > >>>>>> > >>>>>> > >>>>> But will it offer open aperture metering on the 645D? > >>>>> > >>>>> > >>>> Impossible to say without having a 645D to play with, don't you think? > >>>> But I'd be surprised if it didn't. > >>>> > >>>> > >>>> -- > >>>> PDML Pentax-Discuss Mail List > >>>> [email protected] > >>>> http://pdml.net/mailman/listinfo/pdml_pdml.net > >>>> > >>>> > >>>> > >>> > >>> > >> -- > >> Entropy Seminar: The results of a five yeer studee ntu the sekend lw uf > >> thurmodynamiks aand itz inevibl fxt hon shewb rt nslpn raq liot. > >> > >> > >> -- > >> PDML Pentax-Discuss Mail List > >> [email protected] > >> http://pdml.net/mailman/listinfo/pdml_pdml.net > >> > >> > > > > > > > > > -- > Entropy Seminar: The results of a five yeer studee ntu the sekend lw uf > thurmodynamiks aand itz inevibl fxt hon shewb rt nslpn raq liot. > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > -- Scott Loveless http://www.twosixteen.com Shoot more film! -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
