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Message: <blockquote data-quote="nickt" data-source="post: 411840" data-attributes="member: 4923">My old 50mm lens that I had since film days was very strangely tight on my d7100. It gave that bad feeling of aluminum to aluminum rubbing. I very carefully applied a TINY amount of vaseline with a pin point to various spots on the lens mount. I can't overemphasize TINY AMOUNT. You don't want lube getting in your camera or on the contacts. It made a huge difference. After a couple on/offs, I then carefully wiped lens and camera mounts with qtips to be extra sure there was not any accumulation of lube to migrate where it should not go. There was some black on the qtip after cleaning. It remains good for 2 years now. If the idea of lube scares you, maybe just trying cleaning the mount with a pad very lightly moistened with alcohol. Very lightly moistened, you don't want any chance of a drip.</blockquote>