K&F Concept 52mm ND2-ND400(1-9 Stop) Filter, Variable ND Filter(Neutral Density), Ultra-Slim/Nano Coating, for Camera Lens

Me gustó y supero mis espectativas. Con esta versión la tapa de mi objetivo, un Sigma 24-70 si se acopla perfectamente, cosa que no ocurría con un filtro Neewer. Yo lo utilizo para hacer retrato en exterior a un diafragma de 1.8 o 2.8 y con un softbox.

Don't get me wrong, this is a great filter, I've used it a couple of times and it does the job. I actually love it… IF NOT FOR ONE SINGLE, SMALL DETAIL THAT WRECKS THE WHOLE EXPERIENCE FOR ME: I can't attach my lens cap on it. I bought the 82mm filter to attach it on my SIGMA 24-70mm 2,8 $1000 bucks lens, and if I actually want to use the lens with this filter, I can't put the cap on it… I basically have a 1000 dollars lens just waiting to be toppled and crash just because I can't protect it because the freakin' cap isn't on it!!! This is really very annoying and please, WATCH OUT if you're thinking of buying this lens. If I had known this, I wouldn't have bought it: the security of my gear is paramount.Note: the filter does its job… but not being able to attach the cap once it's on the lens is a deal breaker for me. 3/5.

Super valid for the money. Great construction. Works perfectly.I recently started filming with the iPhone 12 Pro Max and needed a nice VND filter to get that 25fps 1/48 shutter speed and low ISO. I was able to shoot with the iso on the 30s. Kind of amazing.The footage turned out perfect. IPaired it with the Moment filter mount for 37mm lenses.Would probably be great if it came with a lease cal, but at this price who cares.

This filter has some pretty extreme internal reflection issues with flared subjects. Maybe I got a bad copy, but whatever "anti-reflective coating" that should be in there is obviously not doing the job. I have 2 other K&F filters that do not exhibit this behavior. Frankly unusable into direct lighting.

I didn’t know if this would be a good Nd filter because the price and some of the reviews but I have been using it for a couple weeks and I love its. Really clean image and some reviews say they see an X at the highest ND but I have not personally seen that. For the price this is a great value