This filter is well made and features a metal ring that is easy to hold and rotate. At first glance it is not a slim or flat ring, being thicker than my other slim filters. The concern relates to possible vignetting when using a wide angle lens. The product description claimed that it can be up to 14mm wide without vignetting. While I don't have an extra-wide lens that wide, I tested it on a 12mm fourth-third lens, which is equivalent to a 24mm full-frame wide-angle lens, and I saw no signs of vignetting and the ring is lighter hold and rotate than some ultra-thin filters. Overall, this filter offers good value for money and is cost effective to protect your lens.

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.

This is a review of K&F Concept 62mm Black Diffusion 1/4 Effect & Variable ND2-ND32 ND Filter 2-in-1 for Camera Lens with 28 Multi-Layer Coatings (Nano-X Series)

I bought this to use with my Sony ZV-1 on which I have a Newer LS-18 Wide Angle/Macro conversion lens 0.75x. I was disappointed, but not surprised that there was very apparent vignetting at the corners of the photos. This is due to the wide angle lens. You can crop the photos in post production to eliminate the vignetting. Not ideal but that's what you have to do.

If you use this on a normal lens and aren't stacking additional filters, I'm quite sure you won't have an issue with vignetting.

The 62mm variable ND, 1/4 diffusion filter is great. The filter allows you to shoot longer exposures at slower shutter speeds in bright light conditions allowing you to get awesome shots that would otherwise be impossible to get without the filter. It adjusts to give you between 1 to 5 stops reduction. And since it's also a 1/4 effect diffusion filter, it gives a somewhat soft diffusion effect to the photo and is great to use for portraits.

This is very nice quality filter and priced less than other comparable filters.
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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.