I love that this saves you money on getting several different ND filters, instead having it as adjustable as you want it. It fits great on my Sigma 24-70mm, but the minus about it is that you can't put the lens cap over this filter, so either it's staying on your lens or you'll need to screw this on and off every time you want to take a photo.

I have other K+F filters for other lenses and they have been exceptional. I ordered this duo for the Sigma APS-C 18-50mm F2.8 zoom I use on my Sony A6000. When I stack both filters together, there are severe black corners. When I zoom from 18 mm to 19.5 mm, they are gone. If I use one filter at a time, no problem. So I decided to leave the polarizer on for the summer and reinstall the UV in the fall. Unless I plan to shoot 20-50mm on a given day. These filter rims are so thin that I don't think there is anything on the market that could improve this situation. I have put K&F on other lenses with no problems. Must be just this Sigma lens design.

Purchased to use Sigma 50mm macro, Nikon mount, on my XT3. After some uncertainty by pairing the adapter to the lens (instead it fits the camera body perfectly) I have to say that I am completely satisfied. The optics maintain good quality in both photos and videos. It also looks well built so I hope it lasts a long time.

Just received the pro filter system. Went out to do some fine art shot down by the coast results are fantastic. Love my new system.

For this price you can't do much better! There is some X artefacting at the darkest setting, but otherwise this is a fantastic value for a variable ND. Using this on my Sigma 16mm on an a6400

Bought for a Sigma Art Sony 24-70 and the Sony 28-135 (with Step Down), it is now permanently on my lenses. Additionally, having an ND and a polarizer on the same filter is a really nice surprise, especially at this diameter. For video recording and holding at 1/50 or 1/100 in broad daylight, this is best. A highly recommended essential.

Bought for a Sigma Art Sony 24-70 and the Sony 28-135 (with Step Down), it's now permanently on my lenses. In addition, having an ND and a polarizer on the same filter is a really nice surprise, especially at this diameter. For video recording and keeping at 1/50 or 1/100 in broad daylight, this is the best.
A highly recommended essential.

The way I use this filter is by combining it with a fast lens like the sigma 18-35mm f1.8 art. I use this filter in combination with the fast apertures to blur out the backgrounds in broad daylight without letting too much light into the picture. If I want to make it lighter or darker all I have to do is turn a ring at the edge of the filter.

The only thing that gets me is when I turn it too much and it ends up unscrewing the whole filter out of the threading a little bit. But that's not a bad thing, its just a part of the experience.

I bought it 8 months ago. This has been, thus far, an excellent purchase.