erichard
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Upload & Sell: Off
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I believe the part that is hitting is the shroud, and if this is the case, try to unscrew it (counterclockwise I believe). It may see as though it won't come off, but it should (I think with the passage of time it gets a little stuck). I suppose if you got it off you could try it out without the shroud on and see if it clears. I'm thinking it will, but I don't use Nikon anymore. If it clears, you would then have the option of sanding down that shroud to just short of going clear through the material, stopping every so often to see if it is enough. Be careful to sand parallel to the planes of the shroud base, etc, or you will go through the material on one side, leaving the other side still high. The material is not that thick. One way to do it is by putting wet sandpaper on a pane of glass (or something equally flat) and rubbing the shroud on that, using progressively finer sand paper grits as you near the end (remember you are sanding the very rear of the shroud, not the side that screws on to the lens). I recommend this shroud removal method because you really have no risk of dust, etc, and it is infinitely easier than working with it on the lens.
I actually have two of these 28mm R ROM lenses that clear the 5DII mirror, one that required sanding and one that did not. I'm think I will be selling one fairly soon. This is THE lens for this focal length, IMHO, very sharp from f/2.8, etc., so it's worth the effort. They are fairly difficult to find used.
I'm not sure whether simply shooting without the shroud is advisable or not. I'm not sure exactly what the purpose of it is, but I suspect it protects the inner mechanism from grit, etc entering the mechanism, not to mention something hitting the actual rear element.
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