I got this K&F 58mm variable ND filter (1.5-10 Stops) to use on my iPhone 15 Pro Max via a Tiffen filter mount.

The presentation of this filter is first class and second to none. I was very surprised by the effort put into the presentation, from the included magnetic box to the wallet that holds the filter. It really is top-notch.

The filter itself looks amazing too, with the metal orange pusher which makes rotating the VND easy, and it is very smooth when rotating.

I'm using this filter primarily for video to allow the correct shutter speed when recording 24fps on bright days. Previously, I had purchased the ND2-32, but it was faulty and I found the 1-5 stops were not enough on brighter days. K&F customer service was excellent; they replaced my faulty filter immediately and even sent me a replacement filter box for another filter I had purchased, as it had been slightly creased during delivery.

Overall, I find this to be a very high-quality VND with no discernible color shift or loss of detail. My recordings look identical to those without the filter, except now I'm getting the correct shutter speed for my chosen frame rate.

Another great thing about this filter is the ability to shoot very long exposures with my iPhone when capturing images of waterfalls, cloud movement, light trails, etc.

Highly recommended.