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Message: <blockquote data-quote="Marcel" data-source="post: 79072" data-attributes="member: 3903">I'll tell you I have a very similar situation with a 17-55 2.8 that I bought used (damaged) and repaired by Nikon in Toronto. Works fine on the camera, but when I use an extension tube (Kenko), the diaphragm sticks and if I use anything different from 2.8 it's all overexposed.I checked with other extension tubes ( there are 3 in the set) and the lens works fine with only one of them. Seems the little lever operating the diaphragm sticks to the other twos...But the first time I tried them I was very perplexed and wondering what the heck was wrong.</blockquote>