bought the product for my Sigma 16 F1.4 with a diameter of 67mm to have the dual function of UV filter and lens protection. The product comes in a cardboard box, inside which there is a plastic box with anti-shock polystyrene. So I have to say that the packaging is essential but also suitable for later storage. The filter has written for the characteristics and to understand the assembly noise on the fly in case you can't see the thread in the dark. To use, simply mount it by screwing it onto the lens like all standard filters and you're ready to shoot. Before mounting I had tested the lens and noticed some reflections in rare cases. I must say that with the filter they are certainly limited, but I do not think they are 100% excluded. For this reason I have limited the rating to 4 stars, although probably no filter, not even according to well-known brands, could do better. Good overall, it looks solid and is better value for money on Amazon. Recommended.

I almost returned it when I found out my lens came with a complimentary $50 Sigma lens UV filter. The optics on it are wonderful, but I'm about to go to Niagara Falls and I imagine I don't want to marry my lens cloth.

I thought - why not just test them both under the sink before sending it back? So glad I did!

As if by magic, this K&H filter drains and all the water disappears. The free Sigma filter? It sucks the water! And it's hard to get off!

If you received a free high-quality UV filter and stay dry 24/7, no upgrade is needed. Do you value versatility in all weathers? Buy this now!

Both lenses are Sigma lenses with 2 different brands of UV filters on them. The lens on the left is my 150-500mm with a different brand filter. On the right is my 150-600mm lens with the K&F filter. The left lens looks a little blurry, but the K&F filter doesn't.

Doesn't reduce the picture quality I can tell. You can feel it's weatherproof, but I'm not testing it to see if it really is.

Comes in a plastic case

No complaints so far.

almost returned it when I found out my lens came with a complimentary $50 Sigma lens UV filter. The optics on it are wonderful, but I'm about to go to Niagara Falls and I imagine I don't want to marry my lens cloth. I thought - why not just test them both under the sink before sending it back? So glad I did! As if by magic, this K&H filter drains and all the water disappears. The free Sigma filter? It sucks the water! And it's hard to get off! If you received a free high-quality UV filter and stay dry 24/7, no upgrade is needed. Do you value versatility in any weather? Buy this now!

Both lenses are Sigma lenses with 2 different brands of UV filters on them. The lens on the left is my 150-500mm with a different brand filter. On the right is my 150-600mm lens with the K&F filter. The left lens looks a little blurry, but the K&F filter doesn't. Doesn't reduce the picture quality I can tell. You can feel it's weatherproof, but I'm not testing it to see if it really is. Comes in a plastic case No complaints so far.

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.