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The lens cap is a special one, pushes on, and the size is a 64mm. Along the bottom, next to where it says Made In Japan, it has 64k. I tried the lens cap from my 10.5 DX fisheye, which also fits on the 16mm f/2.8D fisheye, but it is just a tad too small. If you do try one of the self made ones, use a lens cleaning cloth to go between the lens and the cap.
i won that auction last night. i had tried for the same lens on ebay earlier in the week, but lost out on it. i'm surprised it didn't go higher. i just need to get a lens cap for it. what lens cap does it use?