37mm Variable ND Filter ND2-400 (1-9 Stop) Lens Filter Waterproof Scratch Resistant Nano-Xcel Series

The K&F ND2-400 filter is an excellent product with very high quality.
Excellent results in photography, beautifully packaged, and very professional.

have utilized my filter for a variety of different shots and am continually amazed at the image quality I am able to produce. This was worth every penny I spent on it.

like the premium quality looks and feel, the price tag, the dense weight and how rotating the filter has an expensive resistance feel to it. I don't like that it has no 0 ND setting, it goes to ND2 to ND400 then back to ND2 again. I don't like the the outer size isn't in the description, FYI the 62mm filter has a 67mm outer ring size.

The best filter I've ever used. Beautiful design.

Love this product! I use it for my truck photos and family photos and it’s perfect!

A very good investment, it has served me well for long exposure photography and recording outdoors.

Camera - fx3 in slog3 shooting in 4K 4:2:2 10bit 24fps 1/50, 640 iso f1.4 on a 40mm sigma art. With the nd set on its darkest setting with the above settings on a very bright day it’s slightly over exposed with the aperture wide open. If I close it a little to f2.8 it’s a little under exposed in which i need to open the nd filter slightly. This does work really well for video work, it does have a slight color cast but it can be remedied either by adjusting your wb or just fix it in post. It’s negligible if your shooting in log. It doesn’t have hard stops so it does have an x if you go past the working ranges. And if you’re new to ND filters without stops, this doesn’t mean that the filter doesn’t work, it just means that you have to pay attention not to go past. Another thing worth noting is that the markings on the filter are not accurately lined up so it’s best to just either make your own markings or make notations on the ring to tell what is fully closed and what is wide-open without the X appearing. It’s honestly a great ND filter minus the lack of hard stops. The only other annoyance is that it doesn’t come with a cap but K & F does sell one for their older models that will fit this newer model, but you will have to cut a notch in the cap for it to fit correctly. I added a picture of this. I chose this over going with a polar pro due to cost effectiveness, and I’m not upset about it. There is another version of this filter that goes one stop darker up to nd1000 that I was considering getting. But my fastest lens is a 1.4 prime. If I had anything less than that and I wanted to shoot wide-open I would get that filter instead.

If you know who this brand cap is it will fit this filter. I just so happen purchase much lens from a buyer who included this cap with it and it totally fits perfectly. But your normal cap will not. Anyway I love the filter it does a great job just be aware of the cross viniette.

I've not noticed the dreaded X pattern, but I have not tested it near the darkest end where you might expect it to show, and plenty of reviews deal with the IQ well. My 77mm one will accept an 82mm screw in lens hood lens hood. Whilst I think K&F should point these sizes out better, once on, it is a great way to attach the right lens hood, IMO. I think it's a good higher-end budget option (at the offer price).

It’s perfect