I will take some pics and measurement of mine when I get home. I was able to fit the 47XL to the non-XL cone. It required milling down the outer rear element protection ring, to take some material off the edge. (I used a belt sander then some fine hand-sanding.) That allows it to clear the rear opening. The XL cone has a slightly hogged-out rear-opening to allow the XL rear element to clear with the full rear protection ring in place. The rear ring comes off with one setscrew (tiny) holding it on on the outer rim of the rear protection ring.
I forget what my solution was offhand to the apparent differences in the F-F distances between the two lenses. I didn't add 7mm of spacers, I am pretty sure of that. It does focus to infinity no problem, and seems to be on-the-money as far as the helical calibration and whatnot.
I think due to the cone spacing I do lose a little of the close-focus range, instead of being able to focus down to .5m or whatever, I think I am limited to focusing down to 2m or something. But, given the giant DOF of this lens, it's a non-issue IMNSHO. I will double check if that is an issue with this lens or if it was the issue I ran into fitting the nikkor 90/8 to the Cambo Wide. (one of these lens fitments lost some close-focus distance, I forget which it was offhand... but in either case it was a non-issue to me.)
I will post some pics later of my setup. Also here's a pic of what the actual 47XL rear panel looks like from the inside, which may give you some ideas on this. You will also almost certainly want the IIIc center filter for this lens, there is giant fall-off without it.
-Ed
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