Very well made article with attention to details such as coloring, important weight, but better this way, it is really solid and once mounted on the machine with an m42, it has no play.
I would say Excellent, worth the cost.
It also has its own dedicated packaging.

The ring does what it is told. I deduct one star for the fact that I had to readjust the mount myself so that the aperture and focus indicator of my lenses is straight and not on the side.

As the title suggests, this is the classic M42 -> E-Mount adapter, it has no difference from that of the Neewer, only that the orange color matches perfectly with my A7M3 so I just took it for the fun of having everything matched.
it is built entirely of metal and in a month and a half of use it had no problem with ferrules, painting of any kind.
Personally I use it combined with a Helios 44/2, Jupiter 200mm f4 and a Tair 3AS 300mm and it does its job, including focusing at infinity.

At first I was too rough with the M 42 and all the rings came at me. In the photo shop I trust, they quickly tightened the screws for me. Well, it's just made for old lenses. So all good.

-Delivery arrived on time.
-'Goes well with my Sony a 7 iii optically,

use the ADAPTER for my Helios 44-2

, I've attached a few picture results.

Overall top. Clear purchase recommendation.

great product fits perfectly, I don‘t see any problems so farvery good quality

As you can see from the pictures, the perfect combination. (Helios and Sony) Very high-quality workmanship, beautiful optics, the thread runs nicely and comfortably. It is for purely manual objects.
Many Thanks

Taken to test a 28mm vivitar with m42 mount. And I didn't have any problems

Its fine. Had issues before with their adapters but not this one.

There were cheaper products but I think at some point it is better to choose a product like this one, sturdy and light at the same time

I recently purchased the K&F Concept Updated Nik to Sony E Adapter for my Nikon Nikkor AI/F mount lens and Sony A7r II camera, and I must say I am extremely satisfied with its performance. Unlike the previous converter I owned, which didn‘t work due to being an older version, this updated adapter has exceeded my expectations.
First and foremost, the compatibility of this adapter is outstanding. It seamlessly connects my Nikon lenses to my Sony camera, allowing me to utilize the full potential of both systems. I no longer have to worry about compatibility issues or purchasing new lenses for my Sony camera.

The build quality of the adapter is exceptional. It feels sturdy and durable, providing a reliable connection between the lens and the camera body. The mount fits snugly, ensuring there is no wobbling or movement that could affect image quality. I appreciate the attention to detail in the design, as it truly feels like a high-quality product.

One of the standout features of this adapter is its manual control functionality. It allows me to retain full control over the lens, including aperture adjustment, focus, and depth of field. This feature has greatly expanded my creative possibilities, as I can now use my favorite Nikon lenses with the flexibility of manual control on my Sony camera.

In terms of performance, I am impressed with the image quality I have achieved using this adapter. There is no noticeable degradation in sharpness or clarity, and the colors are rendered accurately. I haven't experienced any issues with autofocus or other technical glitches, which further demonstrates the reliability of this adapter.

Lastly, I would like to mention the excellent customer service provided by K&F Concept. When I encountered an issue with my previous adapter, their team promptly addressed my concerns and recommended this updated version. Their willingness to assist and ensure customer satisfaction is commendable.

In conclusion, I highly recommend the K&F Concept Updated Nik to Sony E Adapter to any photographer who wants to use Nikon lenses on their Sony camera. It offers exceptional compatibility, robust build quality, precise manual control, and outstanding performance. With this adapter, I have finally been able to fully utilize my Nikon lenses with my Sony A7r II, and the results have been fantastic.