This is the first lens filter I’ve ever used. I’ve always read/heard that a good filter can make a significant difference, but I never ended up getting one until now. This polarizing filter is very nice! It’s easy to see the quality construction of glass and metal. In my pictures, you can see that the filter is attached to my camera, but I was also able to attach my lens hood directly to the front of the filter. It has front receiving threads in addition to the rear threads. A really nice feature is that the front of this filter freely rotates. This now allows me to easily rotate the tulip hood to the best position without any risk of the filter or hood loosening. I couldn’t do this when the hood was connected directly to the camera. Does the filter make any difference though? I’m pleased to say that it works very well! I often take pictures through a window, and it's very common for the picture to have a certain “haze” to them that wasn’t there if I took the same picture outside. I took a picture through the window with this filter in place, and I was pleasantly surprised to see a picture that looked like I had taken it outside. I don’t know exactly how this works, but it does. Just like polarized sunglasses, this filter “controls” the light in a way that improves what you see. I’m impressed!

These are well made filters, the ring is very small so they won't cause any vignetting even on fairly wide angle lenses. These threaded onto my lens smoothly and stayed on securely. These circular polarizers reduce the light only a little, and once they are screwed on there is an outer ring that lets you rotate the polarizer to get the best effect.

You can use these to reduce reflections from things like water, glasses and windows. Because it reduces reflections, you can see down into water making it look clearer and cleaner. It also helps deliver a clearer sky image when taking photos outside.

This is the "D" series filter, they also have a "K" series. I'm not sure the exact difference between the two as K&F's own website doesn't really explain it. As near as I can tell the "D" series ones (this one) are a slightly more expensive design with more layers of coating, including water/oil repellant coatings on both sides. They describe these as "waterproof".

Worked well with my ND filter.

Sizing was correct and threads allowed easy install. sturdy construction.

It’s a nice pair of sunglasses for my Olympus

I really love K&F concept's filters - they just work... every time. This CPL is both affordable and made with great quality glass. There's no vignetting on my 18-140mm lens. And most importantly there's no color shift like you get with other CPL filters. The threads match up with my camera's lens, and the adjustment ring provides just enough resistance to make adjustments smooth and convenient. This is an excellent polarizer, you won't regret this purchase.

My fall to company for camera equipment.

Excellent Lens Filter!

What more do you want! If the price-performance ratio is right, everything is fine! I am personally very satisfied with this filter! Of course, as a layman, I didn't test every corner professionally! But as a layman I can be satisfied with that!

Item is delivered within time, product according to the description on Amazon, good. Tip: Do not overtighten the filter frame when attaching it to the lens, otherwise you will have trouble disassembling it from the lens.