Mark_Kl

Perhaps, but when I remove the camera battery, the aperture (of any lens) still opens. Not much electrical contact without power, right?

Great, thanks for the tip!

Thanks for the tip, I will indeed do so.The lens is still under warranty, I bought it about half a year ago.

Perhaps it could be the same problem, only I don't notice any difference between my D7000 and  D60 in aperture levers. There is no reduced travel or play in any mechanism. Also, the lens' aperture...

Perhaps. I will try to clean the contacts and hope for it not to come back.Still. I have my doubts the problem is purely electronic. The camera not seeing the lens is one part of the issue, another...

The contacts on the lens do not appear dirty. The problem is lens specific so I suppose the lens mount on the camera is still ok. The lens itself is appox 1/2 years old and hasn't gone through any...

Sometimes when I attach my Sigma 8-16mm to my D7000 the aperture of the lens does not open. When I take a picture, the aperture remains closed and no metadata is recorded from the lens. The issue...