Before the rush

Before the rush
by evan-pak

Submit your Photo
Hall of Fame

Please participate in Meta
and help us grow.

Photography Stack Exchange is a question and answer site for professional, enthusiast and amateur photographers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

This lens will not operate in A-Dep (Auto depth of field) mode on my Canon 40D. I recently bought this lens second hand. It works very well in all other modes. Is this the start of a terminal problem? Advice please?

share|improve this question

Maybe, it depends if you buy other Tamron lenses :)

A-Dep requires a lens which transmits distance information to the camera. This is needed to compute DOF in addition to aperture and focal-length. Not all lenses do that and I suspect you will rarely find this among third-party manufacturers. They may do it at some point - or already on newer lenses - but remember that each third-part AFAIK has to reverse-engineer the mount protocols and they do not get it 100% right which is why they occasionally stop working with newer cameras.

In other words, your lens is probably operating the best way it can and there is probably no reason for it to degrade any faster than another lens of the same quality.

share|improve this answer
Many thanks, that answers my question. I believe I have a sound lens! – user17432 Feb 27 '13 at 22:52
@user17432 - No problem. Just a note, since you are new here, that if you mark the answer as accepted, visitors will see it as answered. – Itai Feb 27 '13 at 23:41

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.