K&F Concept 77mm ND Fader Variable Neutral Density Filter ND2 to ND400 for Camera Lens Ultra-Slim, Multi Coated

This is not a bad filter for the price. I took it out for a trial run doing some waterfall shots this past weekend (you can see the results attached). My overall impressions: - The picture quality was pretty good, but not always tack sharp. - It does suffer from the dreaded black X at the MAX ND setting, but no issues on the lower settings. - It was nice to be able to adjust the ND setting on the fly rather than having to swap out filters. In fact, I frequently found myself adjusting it to the MIN setting to check composition and then moving back towards MAX to take the shot. - The build quality seems good and turning the filter felt smooth and fluid. - No hard stops at MAX or MIN settings, so you have to pay attention there. - The indicator dots don't tell you what ND setting you are on, so you need to keep track. - The filter is larger on the incoming end, so the lens cap from your lens will not fit. - I notice some lens flare with the ND filter when the sun is near the viewing angle that don't show up with just the lens. Since my lens shade does not fit due to the filter end being larger, I had to manually shade the lens to make the flare go away. Overall, pretty decent for a variable ND filter. I probably wouldn't use it for professional-quality pictures, but it works for someone just wanting to try an ND filter and not wanting to have to lug around a whole set of filters on a shoot.

لا يتم تعتيم قوي للشمس ، وبالتالي لا يمكن تصويرها أو تقريب الزووم لها

Great lens filter but it does loose a bit of image quality. I used this on a Blazar anamorphic and found that at 6k the quality drops a bit and soften the details at a higher stop. The fit is a bit tight on the thread at first but soon became easy to fit. The adjustment gets a bit loose over time but overall good. I would recommend this if you don't really worry about quality drops.

Its alright but it's not lens cap friendly. I end up not using it often because of this.

I took this filter on a job where I was filming outside. I used them on a Sony A7R5 with 85mm f1.4 lens. Every picture was blurry. It looked like two images overlapping each other. Every picture was unusable. As soon as I took off the filter the pics were great, so it was the filter causing the issue. I don't understand what I could have been doing wrong. I will contact the manufacturer to see if they have a solution. If the solution is good, I will update this rating. The filter looks and feels like it can do the job, just perplexed as to why it isn't.