I recently upgraded my Canon camera collection to a 5D Mk III. My 70-200 II f/2.8 (77mm) already performed great, but this polarizer really made the pictures pop! The multi-layer coatings kill virtually all of the reflections. It's extremely thin so paired up with my 17-40 f/4 lends no vignetting even with a second filter attached. K&F quality rocks and you should be very pleased with the quality!

The product comes with quality packaging, externally cared for while internally we find a plastic package to transport and store the filter itself.

(in the video you will find, unboxing, first impressions, test and review)

I will not dwell on the technical specifications since they are already widely mentioned in the product description but, I will tell you about my experience of use and impressions.
As soon as we open the package we immediately find the filter in our hands, housed inside its transport package.
It is immediately noticeable how the filter is of excellent workmanship as regards the materials, the coating of the glass is easily visible since it tends to give a greenish reflection to the lens but, this reflection does not change the tonal range that we will have in the photo, the filter however tends to lose about one stop of light.
I immediately tested the product and it was highly efficient, firstly because it does not tend to create lens flare resulting from the presence of lights and headlights, secondly the adjustable polarization manages to bring it to a good level and also cancel reflections on water and shiny objects.
The loss of detail is almost negligible.
The tests were performed on a Sony A7M2 with a 50 F1.8 lens

In conclusion it is an excellent product that boasts a good quality/price ratio, my final rating is 5 stars

A great CPL for any photographer. It's built well, light, and thin. Easy to carry around, and works very well. Helps cut down on reflections from things like water. Highly recommend!

I've used this with my Canon 28-70 f2.8 lens and it is fantastic! It fits perfectly and works well, and produces great images even on extremely sunny days.

Works like a charm, nothing bad to say.

After my experience in spring, My filter was replaced and I tested on another lens and experienced no issues.

I will continue to support Kent faith since most of my accessories tripods and bags are K&F concept

I purchased this filter and the kf ND100000 filters for the solar eclipse in April. The threads stripped easily and could not remove off my experience sony lens. The lens had to broken in order to remove. Very disappointed

I bought this filter to use on an older T4i that I take on my boat. Overall, I'm super happy with it and you can adjust the level of polarization by turning the ring. I was not expecting that feature for the price paid.

 Good

I'm happy with the results of this CPL filter. It's well made and screws in smoothly. Adjustment takes some force, but it's also to prevent it from drifting or getting bumped. I didn't notice any appreciable reduction in image quality.

I needed a CPL filter for a lens with a 77mm filter thread. This one fits perfectly. All the threads lined up and it installed easily. It does a great job polarizing the scene so I can get photos without reflection on water and other surfaces. I was trying to catch some photos of salmon migrating upriver, but the weather hasn't been cooperating. I hope the water clears soon so I can try again. It's a great lens filter for this because it lets you see the fish under the water much better. The quality of the filter is great. It is sturdy. The glass is clear with no defects. I am very happy with it. It comes with a nice storage case too, to protect it when you are not using it.