I purchased the K&F X-PRO Square system. I've used other filter "systems" and most work as expected. These filters fit for all of my Nikon lens filter of diameter up to 77mm (or actually 95mm on the mount). The material and construction is exceptionally well manufactured and well thought out in its design. The included manual is clear and well written for we English speaking/written folks at least. The adapting rings offer "just enough" purchase for screw mount to the lens, so be patience and carefully on the mounting them... could use a few more threads, I suppose. Mounting the 95mm polarizing (CP) is a snap - insuring you position the proper direction. Of course, you have two different ways to rotate the CP - using the handy knurled thumb wheel or to lighten the locking the full frame and/or from the full frame assemble.

Now, since I did not give you ALL of this products 5-stars for a silly reason. The package and the "Storage Case" is over killing! Beautifully packaged, thoughtfully planned for the full system with space for growth. I/most have their own storage and transport camera cases(s) and most do not fill this beautiful storage case! I would rather have had another filter or a more spartan case for individual filter cases for my camera bag... as a trade for the case! For me, I found another small & padded case, for my new K&F bracket + the CP perfectly for my camera bag. AND I had hoped that the K&F offered properly protected for individual square lens w/frame separately purchased - but not with success.

SO - it's not Perfect for my needs - though almost! Although this is my "first K&F product, I strongly recommend based on my first purchase!

Produit reçu dans les temps et de qualité

J'ai attendu un peu avant d'acheter par apport aux autres marques aujourd'hui je ne regrette pas un très bon produit

Product received on time and of quality

I can only recommend it! Top quality and very easy to use

This filter set is exactly what I was looking for. No plastic or light leaks here. It's very well manufactured and packaged. All light weight aircraft aluminum and optical glass. No color distortion in the filters. Everything fits nice and snug. If it didn't, then you would be inviting light leaks. Some reviewers said the fit was too tight. Not mine, it was perfect. Looking forward to using these on a daily basis. Great job K&F.

This is a high quality well constructed system. Highly recommend

These are great filters and holder. Works with a large variety of lenses, I use this frequently, it never leaves my camera bag.

I can't say that I've mastered using the filters, but I feel like the build quality is top-notch and I'm looking forward to getting better with my photography.

This square filter system is much better quality than the cheaper equivalents. Since the filters have frames, those are easy to handle, without smudges and scratches. The size is enormous (good for wide-angle) and the CPOL integration is definitely an advantage.

I suggest to try out the entire setup at home before using it for the first time (the attaching mechanism of the filter holder to the lens ring is tricky, make sure it locks properly, else you might need to fish for it in the lake...)