Thanks useful information: 
Recently invested in a Tokina 11-16 pro II lens for my Nikon D5100. Initially it took a few test shots fine but since then I have been having some problems. When I press the shutter it doesn't work. The camera just won't fire! Must be something to do with the lens or lens camera compatibility as my other lenses are working fine. I checked the d5100 was compatible with it before I bought it. Do you think I have a dud or is there something I can try before sending it back to the manufacturer? (Bought overseas so its going to be a real faf!) Its so frustrating - missed some great shots as a result and was planning a sunrise shoot tomorrow :-(
Ought to add, i have tried resetting my camera, using manual mode, taking it off and putting back on again....
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