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hello there folks, i have recently got a nikon d50 dslr with a nikkon af nikkor 35-80mm 1:4-5.6d lens and although i am starting to get to grips with it i was wondering if some one can tell me why when i turn the lens to one of the numbers either 4 , 5.6 , 8 , 11 , 16, the camera say's error...