I was surprised with the build quality of this adapter, it being very good!However, I use a Fujinon 55mm f/1.8 manual lens with this on a Sony A6500, and I cannot focus to infinity.This is because the adapter needs to hold the lens ever-so-slightly closer to the sensor.I know it is not a problem with the lens as it focuses to infinity just fine on my actual M42 mount film camera.Any focus closer than infinity works just fine, it's just a little frustrating that I can't use this for landscape / long shots.
28/06/2019
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
Excellent adapter, does exactly as it should. I can now use my selection of M42 lenses on the Sony A7ii the way they should be used.
11/02/2018
04/12/2017