This K&F black diffusion filter is a great kit. It reduces contrast, makes blacks slightly grayer, and provides a soft bloom around highlights. This 1/8 filter is the weakest, but it still makes a noticeable difference to the look of the images you take with it. . I was able to test it side by side with a Tiffen Black Pro Mist filter, and the results from each filter are extremely similar to the point where I don't really see a difference in the image, and I certainly couldn't say that the one or the other is better than the other. Both frames are made from aluminum alloy, and I think any aluminum frame can benefit from a little grease, even if it's just grease from the skin of your fingers that you rub on the nets. More expensive filters have brass frames which tend to be much smoother and don't stick. The K&F filter has approximately 1.25" deep machined grooves on each side of the filter, which provides excellent grip for your fingers when screwing/unscrewing the filter. One aspect in which K&F is the clear winner is that the K&F filter housing is far superior to the Tiffen housing; the Tiffen case is a square case in which the filter is loose on a piece of polystyrene, while the K&F case is superbly designed to hold the filter in place very securely thanks to a clever system of rubber grooves which can accommodate different sizes of filters. There is a filter thread at the front so you can stack another 77mm filter on top. Overall I find this to be an excellent quality filter that is roughly on par with the quality of Tiffen filters. It's a useful tool to have in a camera kit and well worth investing in.