Matt, See this diagram that I have crudely drawn.
http://picasaweb.google.com/rf.sullivan/LensRepair/photo#4982517534313021458 It concerns some of the small parts you highlighted in your 2nd picture. The little curved cap is an electrical contact for the "A" setting on the lens. When "A" is set, this little cap sticks up out of the small hole in your mounting flange. You can see it at about 8:30 on the silver flange in your picture. To drive the little cap up, it is spring loaded. To keep it from flying out, it is caged by the L-bracket in my diagram. The groves in the cap go into the slot in the L-bracket. The whole thing rests in a spot on the lens body (8:30 again?) The button at the bottom of the L-bracket rides in a broad grove on the inside of the aperture selection ring. Most of the time you have selected f4 thru f22 and the button holds the bracket, which holds the spring loaded cap down and away from electrical contact with the camera body. When you select "A", the aperture selection ring moves over just a bit further to where the grove is wider and the cap is allowed to pop up. To get over to the "A" selection, you've got to press in the "A" button and twist the ring. The "A" mechanism is locked IN or locked OUT by two leaf springs which prevent you from accidentially twisting into "A" when you wanted f22. You seem to have a good handle on the little ball bearing and spring which you haven't shown. They go in a radial hole in the lens body under the aperture selection ring and make a click as you twist the ring. The last tiny bit you have there is unknown to me, I suspect it is something to make electrical contact within the lens - from the cap or L-bracket to elsewhere. Getting the spring loaded ball bearing, L-bracket with spring loaded cap, and the other bil all aligned and working under the aperture selection ring is a challenge. Regards, Bob S. On 10/4/06, mike wilson <[EMAIL PROTECTED]> wrote: > Matt Kelch wrote: > > > In trying to disassemble a lens I accidentally dislodged a few parts > > without getting a good look at how they went together and where they > > went. I would greatly appreciate any help. BTW, it is a SMC PENTAX-A > > 70-210mm lens. > > > > http://www.vulc4n.com/images/lens1.jpg > > http://www.vulc4n.com/images/parts.jpg > > > Welcome to hours of fun! > > If you search the archives (you might have to go to mailarchive rather > than the pdml ones) for "A50/1.7", you should find a thread about > replacing these very parts. There was a link to a diagram in there, > somewhere. > > I'm not joking about "hours" - if it takes you any less than that, I'll > be seriously cheesed off. 8-) > > -- > 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
