Thanks for the replys. Camera recognises lens now. Great advice.

I`m new to dslr so please forgive the question.

Bought a Pentax ozeck 80-200mm lense from ebay. The lense fitted okay and could focus via the view finder. But the camera seems to fail to recognise the lense. It doesnt show any f numbers and fails to take a picture.

Sorry the description is so vague.

DSLR is pentax k-x
lense Pentax Ozeck 80-200mm f4.5 macro zoom lens

any help much appreciated