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.

This is perfect combination filters for my OSMO 3. Wide angle lens, CPL and ND was amazing combination. And the most thing I like is that, I can turn off the OSMO 3 without taking out the filter. It’s thin and no worries that it will damage the gimbal once you turn off the OSMO 3. PERFECT

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.
Helpful
Report

Mounted on a wide angle lens, the rendering on water / lake pictures is perfect.
Rigid carrying case to avoid damage.
Good image quality. I did not notice any vignetting or color modification.

The filter works best if you have a lens that is greater than 35mm. When the lens is too wide angle is when you get the X looking area

Got this to reduce overexposure with wide angle Canon 17-40 4L lens. Very happy with the results so far and it's really great for long exposures. I've been a K&F lens filter for a number of years and these have been my primary ND filters.

Hi use the filter on my wide angle lens. Unfortunately, at the max setting, a lens flare forms, which unfortunately doesn't look so great. At min setting it is ok (no lens flare) Processing is super. Unfortunately only conditionally usable. ML

I bought this ND filter for my wide angle lens and am very satisfied with one thing. The filter is well processed and makes a high-quality impression. But when the filter is on the lens, unfortunately the lens hood no longer fits on it because the front ring is slightly larger than the lens diameter. So far I could not see any color cast in the pictures I have taken so far.