Early review: I disregarded the recommendation not to use this adapter on the Sony A7II. The fit doesn't give me any cause for concern. No play, but no unexpected resistance when attaching it, either. Functions well with my collection of Nikon lenses.
02/10/2018
Very well constructed. Excellent materials and fit & finish. Highly recommended.
27/09/2018
26/09/2018
The adaptor itself seems to work fine. I've used it with lenses like the Helios 44M 58mm and Helios 28mm wide-angle with much success. However after shooting with it for several days, I've noticed maybe a dozen fine metal particles covering my A7ii's sensor. I can't be certain whether the particles came from a lens or the adaptor itself, but it might be a good idea to leave one of these adaptors on each M42 lens you have, or purchase a more expensive one that won't wear.
03/05/2018
Seems well built, had very little use so far but very happy. Would highly recommend
01/04/2018
1 star missing because it doesn’t really work well with the Takumar 50 1.4 (the lens doesn’t focus to infinity as others have mentioned). The other four stars are because otherwise it is built well and I’m sure will work with most other lenses. Using it on a Sony A7R III and it gives me nice and sharp images even with that sensor so well machined I’d say. Although I also have the same brand adapter on a Fuji XT2 and it still focussed to infinity (though it did get a little stiff at that end) so I’m not sure if they’re all manufactured exactly the same or it there is a difference from version to version. All in a all a good product.
03/03/2018