I have a Tamron 28-75 f/2.8. Haven't used it for some time. It was just lying down in my Digicabinet. Recently thought of selling it off. When i went for the deal, i found that if i turn the focal length to around 70-75mm there is a some error on the screen saying some issues with contact ... please clean it ...
Strange thing is that it happens only on that focal range, but once error pops up, i cannot use it until i power cycle my cam. and this issue is only with this lens.... there is no other issue with any lens.
Anybody has idea what's going wrong... it's not in warranty, so no blind suggestions on " go to service center "