K&F Concept58mm ND Fader Variable Neutral Density Adjustable ND Filter ND2 to ND400 for Canon 600D EOS M M2 700D 100D 1100D 1200D 650D DSLR Cameras + Lens Cleaning Cloth

Good

solid build quality not that expensive and not cheap either..

Don't buy this product its useless waste of money worst product i've ever bought👎🏻

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I m happy about this 10 stop ND filter it’s good for long exposure photography

Wide diameter and easy to adjust. Comes in a protective box for transporting it.I fancied trying some long exposure shots with my smartphone. I already had bought fixed filters but there was no adjustment to them without shooting through several layers of glass. Thought I'd try this one as it was adjustable. It's like having two polarising filters mounted together and is infinitely variable from light to very dark just by twisting the frame.It does take a bit of fiddling and post editing to get some natural colour back, but it did what I wanted it to and am waiting for some better weather to spend a bit more time tatting with it. Its is big enough to cover all the lenses on the back of the phone with room to spare for hand movement though you do need to hold it very close.Obviously a tripod is needed and a steady hand is helpful.It was suitable form my needs and I recommend it.

If you're photographing macro, jewellery, insects, etc, and you need the flash really close you're going to have really overpowered flash usually, and need a ND filter so you can stay at around 5.6 and avoid diffraction and then stack, and with the lights that close to the lens you'll need a lens hood to avoid flare. You can't do both with this filter.

I've been a pro photographer for nearly 30 years and have carried bags of ND filters around, wishing for something like this. I was quite surprised by how good this is. It has saved me time and space in my camera bag. No more faffing around with switching filters, now I just turn it. Well made, too. Would definitely recommend it.

Unless you're looking for a huge shadow in your photography then I'd leave this well alone, I risked it as I like the quality of this companies tripods so thought these may avoid the dreaded darkened X in the photo.At all but the lowest settings there was some sort of shadow in the picture, making any shots unusable, luckily I experimented before taking it away on holiday

They do not work with lenses with a focal length shorter than about 100 mm. The filters have a severe flat field problem with shorter focal lengths. See image below of a 'flat' blue sky. I beleive the problem is either due to the 2 layers of glass or else an impact of the dual polarisers which is how these work. Compounded by the angle the light goes through the filter with wider angle lenses.