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Hmmm .. interesting. Looks like they made it for one fits all as the opening is good for the 90/2. I bought the kit for that lens to use on my D800... not converted it yet as I was thinking about putting it on my 18/3.5 to use it with a Nikon shift adapter on my Nex bodies.
I think I would go with a dust skirt, but I'd look for a thin plastic or rubber sheet to form one from so that it won't shed particles. Pls post photos if you make one.