haven't had a chance to do real tests yet, but I did take a few test shots in my garden to check for sharpness loss and color stem. I used a macro lens to check fine detail and a wide angle to see if it was consistent throughout the frame. I also compared it to my Lee Filters-sized stopper. I couldn't detect any significant loss of sharpness throughout the frame with either the macro or wide angle. There is a small color cast when looking at the exif data, but the in-camera shot has mostly adjusted it and can be edited manually if needed. Importantly, it seems to be consistent across the frame, even at 10mm on my apsc sensor. I've experienced the angling at wide angles (both 10mm and 22mm) but again it can be edited very quickly in Lightroom. It would have been nice if it came with a light gasket but for the massive difference in price compared to the bigger brands I can forgive them that. They can be purchased elsewhere online if needed, which I will do. Overall I'm pretty happy with it which is just as good as it made the slip through my Lee Filters binder when I wasn't paying attention and fell on the paving stones in my garden chipping the corners of the glass. That's my own fault though as it's a known issue I have with the holder, same issue with my Nisi filters in my holder so I think it's a bit worn out.

good finishes, made of aluminum and not plastic. Bad, nothing to highlight.

Good value for money, delivered 1 day in advance.

Everything's fine, thank you! Fast delivery, nice contact. Super price / performance ratio. The filter looks great after the first look, will be tested!

Very good quality, few dispensers and easily solvable.

Excellent sharpness, well built

I used it to take long exposure shots at one of my local beaches and it works great with no noticeable color cast. My only reservation is the size of the filter. I use a Lee filter holder and have been told this K&F filter is compatible and IT IS BUT beware! It seems a bit thinner than the Lee filters and it can start to slide down through the holder. Luckily I noticed this before it slipped out completely and rotated the holder 90 degrees to prevent it from happening again, but this prevented me from combining the filter with a separate ND grading filter. I'm sure applying a tiny strip of acid free tape to two opposite edges to add thickness will solve the problem.

Everything as expected. Easy installation and you're good to go. Very good.

Good filters that do not give excellent, quality, crystal dominates, well presented in a cardboard box, then in its magnetic leather case. Mark the product

very good quality (glass)