so my other lenses work fine.
Well constructed and has a clear feeling of quality. I have used it on a 35 year old 200mm Pentax lens and works perfectly. My only comment is that on my Fuji XT-2, as I rotate it, it is quite tight when clicking into place. Equally, it is initially a little stiff when disengaging during lens removal, but that does not have any effect on its operation, and has caused no damage to electrical contacts etc., so my other lenses work fine.