Despite the mention in the description, saying that is not good for wide angle lenses, I purchased it for a Viltrox 16mm f:1,8, EF mount. The results are outstanding across the entire range of the filter. No X cross, no vigneting. At least for this specific lens, the filter is perfect. Is true, the size of the barell is twice the size of the front lens, leaving enough room for any kind of filter.

Slim, very good with wide-angle zoom lenses

I recently purchased this car dash cam and have started to make use of it. It has a wide angle camera that can be placed in many locations in the car to record, the 1080p resolution makes it take clear videos and works well at night. 360 rotation and wide angle cameras are also very handy and easy to use.
The loop recording function is also very good, he can let me not worry about the SD card is full.
In general, it is cheap and good value for money with good quality.

have a Sony A7iii and I was looking for a good adapter for my 2 Canon lenses, 85mm f/1.2 and 11-24mm wide angle lens. This K&F Concept Adapter fits my Sony A7iii well and supports the lenses. I was skeptical about the sharpness of the photos. However, this adapter really nails the sharpness. It's better not to use the widest aperture, because lenses from other manufacturers work extremely poorly. Both sample photos were taken with this adapter. The shot in Florida was taken with the wide-angle lens. The mountains are recorded with 85mm. Autofocus is excellent on a 7iii body, so I didn't see any significant difference between using the adapter and the native lens. Eyefocus works very well even in low light conditions. The good thing is that I was expecting a lot of vignette, but I was surprised to find out that this lens doesn't produce a large amount of vignette. So the bottom line is that you should give this adapter a try. It fits well, not too tight like some cheap adapters. The build quality is really good. Happy clicking!

The adapter works very well and all lenses from wide angle to tele and tamron to sigma worked with the camera without any problems. I even found the Canon EOS M's sluggish autofocus to be a little quicker. Now I can use my Canon 60D and the EOS M together without having to change lenses every time. Clear purchase recommendation.

Made from high quality materials. Precision built. It offered the least amount of resistance I've had when screwing on a new filter. It's very thin so it doesn't interfere with wide-angle lenses (as much as possible).

Using a full-frame DSLR, I made side-by-side pixel-level comparisons between shots with and without a filter. One photo was a wide angle shot of the included sky on a high UV day.

Results: Well, I didn't see any difference in color or richness in the high-UV shot, so I wouldn't buy it just for that. Most of the time, people just buy these as lens protectors (and believe me, they've saved my bacon a number of times on high-end lenses now!). As a lens protector, you want it to be as unobtrusive as possible, and I'm happy to report that I can't tell a significant difference in any test shot - color balance, sharpness, contrast - they're all so close I've never been could definitely say that every tiny difference was due to the filter.

ATTENTION! This filter is not compatible with wide-angle lenses.
On my Sigma 16mm it produces a blue X when set to ND1000.
The manufacturer was very nice and offered me a replacement filter.

WARNING! This filter is not compatible with wide-angle lenses.
On my Sigma 16mm it creates this blue X when set to ND1000.
The manufacturer was very nice and offered me a replacement filter.

ATTENTION! This filter is not compatible with wide-angle lenses.
On my Sigma 16mm it produces a blue X when set to ND1000.
The manufacturer was very nice and offered me a replacement filter.

WARNING! This filter is not compatible with wide-angle lenses.
On my Sigma 16 mm it produces this blue X when set to ND1000.
The manufacturer was very kind and offered me a replacement filter.