So I've bought a vivitar, a helios and a pentax and each of them had fit and felt secure in this adapter.The build is simple, strong and secure! Very happy customer.
30.01.2020
This adaptor was very east to fit to my old manual lenses and works very well. I can now use my old 400 lens on my digital camera. Initial expressions is that it takes very good photographs.
19.10.2018
Tremendous product. I was using my usual, cheaper, adapter for a newly purchased Takumar 50mm/1.4 and it tightened the lens up to the point where it was impossible to reach infinity and still move the f-stop. This adapter resolved the issue immediately, it felt like a much better fit and a much more professional product. The lens now moves freely and works perfectly - think I'll probably upgrade all my M42 adapted lens to this stirling effort.
30.08.2018
Great fit on a Pentax Asahi Super Takumar lens and I've been happy with my other K&F adaptors. I'm rating 5-stars based on these factors, BUT should state a warning (likely a rare use case) for anyone looking to attempt what I did: I wanted to adapt my M42 lens to a Metabones Speedbooster (for the extra stop of light) via this M42 to Canon EF adaptor. I would then mount the whole configuration to a Panasonic GH4 (micro 4/3 body).... however, the camera gave me a black screen and indicated no lens was attached. I'm guessing it was the Speedbooster that had the issue and not the camera. Like I said, my other K&F products (on a pentax K lens directly to my micro 4/3 camera) fit perfectly and the lens/camera work together just fine (of course, the focus and aperture is completely manual).
17.11.2016
A well made product. Easy to attach and works well. Very useful for using old style M42 screw thread lenses on modern cameras. Obviously wont work in most programme modes, but I found it is ideal in Manual and stopped down Aperture mode.
02.06.2016
Excellent. Can reach infinity focus which I haven't been able to do with some other adapters.
01.03.2016