Is anybody happy with the adapter?
I'm happy with mine (lever-less version). I just rented a Nikon 14-24 for 2 weeks to test on my 5D with Mark's adapter. Sadly, I had to ship the lens back yesterday. Wonderful combo - the 5D, adapter and 14-24.
The adapter simply works as advertised. It fits both the lens and the camera mount very well and, if you follow the written directions, is easy to mount and unmount from the camera. The focus confirm chip is a very nice and much appreciated addition/feature and works just fine.
I have only 4 nits with the design: 1) the adapter is very thin and sits very close to the camera body and the 14-24 very large so I found it sometimes difficult to mount/unmount by just rotating the adapter and not the lens as well (as suggested by the directions) and it'd be impossible if wearing gloves, 2) while the adapter is marked with f/2.8, f/8 and f/22 points, chosing any other aperture is guess work and can'ty easily be replicated (for my landscape tests, I rotated the lens to approximately half way between the f/8 mark and f/22 mark and judging from the histogram when compared to other lenses I was testing at f/14, at that position the lens was very close to f/14), 3) I often found it difficult to get in a position to see the aperture markings or to get a good angle on them to tell "exactly" where the lens was lined up and 4) when rotating the lens to obtain different apertures, even my smallish fingers would often bump/move either the focus or zoom ring (and I think it'd be impossible to change the aperture without moving the focus or zoom rings if one was wearing gloves). Now don't get me wrong, none of my nits are fatal flaws (to me at least). Heck, I like the simplicity of the thing. The design of the lever-less adapter just requires the user to be very aware, to plan ahead (e.g. set aperture first, then focus/zoom) and to be a bit flexible when it comes to setting your aperture at anything other than f/2.8 and f/22.
Kudos to Mark for making this available! For those of us with a serious interest in using the 14-24 or other Nikon lenses on our Canon bodies, the adapter is a god-send. And the lever version, when it becomes available, will make an already invaluable product even better.
PS: I should add the there is enough friction between the adapter and lens so that once you set the aperture, you can rotate the zoom and focus rings to your heart's content without fear of inadvertently changing the aperture.