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I'm in the same exact unfortunate situation with my recently received defective HAWK adapter. Am considering fashioning some sort of wedge to hold the lock into place as I'm not sure I want to be without it. The idea of it making it back to Taiwan and then a new one to me is a 1+ month commitment.just got the HAWK'S, got a defective copy, the release button doesnt work or allow the lens to seat, he was great, will send a new one, just have to return mine first, which is a drag, they should be tested better...
The problem with this is that not all of my M lenses are calibrated to the same infinity point, so a couple of mine wouldn't reach infinity if I shimmed my adapters. I don't find the ability to focus past infinity a big deal, since I can just use magnification to focus.This is a post I made on Fred Miranda about M-NEX adapters:
So I finally got a NEX7 delivered and have been able to fine tune the Metabones M-NEX adapter. I have 3 or 4 reference M lenses that I used with the Leica M8 that all gave excellent infinity focus and rangefinder focus accuracy. I have used these to calibrate the Metabones NEX adapter with use of the NEX7.
As it turns out, the thickness of the adapter of .381", allowed focus past infinity with degraded sharpness, with all lenses. I removed the M bayonet from the adapter and thru trail and error, came up with a round brass shim of .004" thickness that gave the sharpest hard stop infinity image at wide open apertures. This gave an over all adapter thickness of .385".