I purchased a used Sigma 170-500 off ebay. When picking it up yesterday, visually it all seemed ok.
I've tried it on two K-x bodies with same results - it is a very stiff/tight fit to mount, needing that little bit more force than normally to twist, and the aperture doesn't display on the screen when in A mode. If I tap the lens a little, it will flash up and then disappear again. As though the contact pin isn't making contact. Running my finger over the contacts feels as though the aperture contact actually sit higher than the rest though. manually setting the aperture still works.
Could both issues be related - the tight mounting is affecting the contact?
Is it possible (for a novice) to adjust the mount to make it that little looser?
If I remove the ring to clean the pin contacts (sticky tape on outside on pins to keep in place as suggested elsewhere) are there any other little surprises behind the ring I should be aware of?
Any other suggestions please?
Thanks
Andrew
Last edited by Stray Dingo; 02-09-2012 at 01:12 PM.