> > >Basically the camera doesn't recognise the fact that the aperture > >ring is in the "A" position, so I can't use shutter priority modes. > > Do you have other F/FA lenses to test and see if it's the lens or camera > problem?
Oh, yes. This lens (and only this lens) fails to register as in the "A" position on my MZ-S, PZ-1p & SF-1. I haven't tested it on the Super Program because that would mean digging around in another box. > I suggest you try other F/FA lenses before you do anything crazy. The > brushes (one for aperture, one for distance info) in these lenses could be > destroyed easily if you don't know the proper procedure. I've done that. No other lens exhibits this problem. > > I'd also like to know what the likelihood is that this could be > > something I could repair myself, something a typical neighbourhood > > camera repairer could fix, or something that will have to go back > > to Pentax. > > If the brush contact is dirty or coated with grease (and that part of the > lens is greasy on purpuse), the fix is easy. Just remove the mount, clean > the contacts, and the assemble. But "clear" threadlock should be applied to > the lens mount screws, and the proper one is "Threebond 1401" (can be found > in Fargo). But the smallest bottle is 200g which is quite big. If the chip > is fired, the whole circuit must be replaced (but this must be very rare). I doubt if the main chip on the lens is fried; I'm getting all the electronic aperture display (which comes through the digital contact pin). I'll try and find the multimeter to confirm the hypothesis that the pin isn't being shorted to the lens mount when the ring is in the "A" position before I go much further. > The job is not very difficult if you know how, but not recommend if you > haven't done it before. I haven't. I suspect my local camera repair shop has, though. (Apollo Camera in Sunnyvale - they're quite good with Pentax gear)
