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Message: <blockquote data-quote="SkvLTD" data-source="post: 434979" data-attributes="member: 12855">You just need to make sure that you can mount it without hitting the aperture reading tab and that you cut out/grow on a tab at the right area on the aperture scale that the camera's tab will then read based on the aperture ring's/camera tab's position vs what you set the max ap to be in the menu.Either if the rear protruded too much or if the the lens was too narrow, there really isn't an easy way to grow a piece of aluminum on to catch the camera's tab. I've tried with my 50/2 and it was simply too narrow. Bolting something on would work, but it's a tad more gimmicky than cutting out an area at the right place.And of course things like the 50/1.2 can never get a 3rd party distance chip is due to the sheer diameter of the rear element.</blockquote>