I bought this for an semi-wide angle (18-55mm zoom). It works great till max. If you hit max (which is at the A on MAX) It does the X'ing. 90% of the frame is "x" till about 35mm..It does well up until last dot (last position before MAX).If you need ND400 or higher, just get a fixed stop ND and stack if you can wide enough.
24/06/2019
My son ordered it for his camera. Unfortunately, It was not the good size for him so we returned it and were promptly refunded.We therefore did not really had time to review it fully but it looked like the real deal.
08/06/2019
Nice quality for the money. Vignetting starts to occur with some lens when zoomed out 20mm and below.
01/05/2019
First variable ND filter purchased (all others I have had have been static) and what a difference it makes!So easy to move around, and not having to carry more than one per lens is a real space-saver in the bag!I've experienced no false colour or the infamous X on any images (although I don't use this all the way closed!)Comparing it to a friends premium ND (I won't mention the brand), I could not see a difference at all in image quality. However, the premium ND was a bit stiffer to move around, so it felt like it would stay exactly where left. The K&F one does feel like it may loosen up over time, although this hasn't happened yet a few months in!
28/03/2019
I like this product for videos. I am a photographer but have been getting request about videos. So I bought this product to help me produce cinematic film
06/01/2019