I just purchased a new Tamron 90mm f/2.8 adaptall macro lens and a adaptall
2 mount for Pentax KA. The lens and mount work perfectly with an older K
mount camera (no electronic contacts) but with my Pentax PZ-1P and ZX-7
autofocus cameras which have electrical contacts, it does not function
correctly. The AE/32 aperture setting is equivalent to the "A" setting in
my other Pentax lenses and that works fine on the Tamron. But when the
aperture ring is moved to 2.8 through 22, the camera LCD show incorrect
aperture information. For example, when I set the lens at "AE", the correct
exposure is 1/125 and f/5.6. If I move the aperture ring to f/2.8, the
camera lcd shows f/4 and 1/1000! If I move the aperture ring to f/4, the
camera lcd shows f/19, 1/1000. At f/22, the lcd would show f/5.6 and 1/250.
I followed the instruction and attached the mount to the lens. I notice
that the connection between the lens and the mount is not completely solid
(I mean I am still able to twist the lens slight back and forth with regard
to the mount). Are there any Tamron adaptall users that can give me any
suggestions? I have also sent an email to Tamron for assistance. Thanks in
advance for any advice.
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