Hi Richard,
Never had this kind of problem with my Tamron KA Adaptall-2 mount
but, normally you shouldn't get aperture readings when in aperture
priority ( with a manual focus lens ). The fact that you do get
aperture readings when setting the aperture ring anywhere else but
AE (or 32) makes me suspect the camera still reads the lens as
being on auto. It looks to me like an adapter mount problem -
perhaps some of the electric contacts are imperfect.
Servus, Alin
BTW. My Tamron is solidly attached to the KA Adaptall-2 adapter.
Richard wrote:
RC> I just purchased a new Tamron 90mm f/2.8 adaptall macro lens and a adaptall
RC> 2 mount for Pentax KA. The lens and mount work perfectly with an older K
RC> mount camera (no electronic contacts) but with my Pentax PZ-1P and ZX-7
RC> autofocus cameras which have electrical contacts, it does not function
RC> correctly. The AE/32 aperture setting is equivalent to the "A" setting in
RC> my other Pentax lenses and that works fine on the Tamron. But when the
RC> aperture ring is moved to 2.8 through 22, the camera LCD show incorrect
RC> aperture information. For example, when I set the lens at "AE", the correct
RC> exposure is 1/125 and f/5.6. If I move the aperture ring to f/2.8, the
RC> camera lcd shows f/4 and 1/1000! If I move the aperture ring to f/4, the
RC> camera lcd shows f/19, 1/1000. At f/22, the lcd would show f/5.6 and 1/250.
RC> I followed the instruction and attached the mount to the lens. I notice
RC> that the connection between the lens and the mount is not completely solid
RC> (I mean I am still able to twist the lens slight back and forth with regard
RC> to the mount). Are there any Tamron adaptall users that can give me any
RC> suggestions? I have also sent an email to Tamron for assistance. Thanks in
RC> advance for any advice.
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