I am a photographer and, in my travels, I also deal with landscaping. over the years I have had the opportunity to try and test filters of different brands and qualities. Quality naturally has its price and from this point of view k & f has never disappointed me. In the filter sector it is the brand with the best value for money. I got to try this long exposure filter and it's one of the best I've ever seen. The glass is of excellent quality and does not cause any loss of sharpness when it arrives in its specially protected imitation leather packaging. it has nothing to envy to more renowned and expensive brands, I point out that I have not noticed any color cast or strange aberrations. If you add an unrivaled price, all that remains is to recommend this filter.

Used many filters and for the money, highly recommend.

Good value for money. excellent quality

This filter is great, very good quality. I like the fact that I can mount it on multiple lenses, with its adapters included. The pouch is practical for storing the filter during transport.

These are not cheap but comapred to Lee Filters a bargain. The filter holder is excellent, and is supplied with multiple adapter rings, which are £26 each from Lee. I can see no significant colour cast. So if you want to experiment with proper filters without breaking the bank these are a good buy. The filter cases are beautiful and the whole product presentation/packaging oozes quality.

I haven't had the change to do real world testing yet but I've taken a few test shots in my garden to check for loss of sharpness and color casting. I used a macro lens for checking fine detail and wide angle to see if its consistent across the frame. I also checked it against my Lee Filters big stopper.

I couldn't find any percievable loss of sharpness across the entire frame with the macro or wide angle.

There is a bit of a color cast to it from looking at the exif data but shooting in raw the camera adjusted it out for the most part and can be edited out manually if required. Importantly though it seems to be consistent across the entire frame, even at 10mm on my apsc sensor.

I did experience vinetting on the wide angle (both 10mm and 22mm) but again it can be edited out very quickly in lightroom.

It would have been nice if it came with a light gasket supplied with it but for the massive price difference compared to the bigger brands I can forgive them for that. They can be purchased online elsewhere if required which is what I'll be doing.

Overall I'm pretty happy with it, which is just as well really as it managed the slip through my Lee Filters folder when I wasn't paying attention and drop onto the paving slabs in my garden, which chipped the corners of the glass. That's my own fault though as it's a known issue I have with the holder, I experience the same problem with my Nisi filters in my holder so I think it's a bit worn out.

Incredible Q / P ratio. The ring and adapters are made of metal. everything fits well on the objectives. The delivery packaging is downright luxurious, and will serve as storage between two shots.
There was a little bit of play around the ring. A little bit of black gaffer and it's perfect. Likewise, the filter slides were a little too tight, but all of that is adjusted with a small Phillips screwdriver.
Perfectly compatible with 10x10 and 10x15 Lee and Cokin filters.

I love K&F 100*100mm Filters, the best quality glass.

No scratch at all. I tried it for sunset, sunrise and daylight long exposure shot.

Excellent filter and quaility