In general - I'm not a big filter guy. I don't even like using the clear UV filters unless I'm outdoors on a windy day. The reason? I want to get as pure an image captured as possible - and every piece of glass you add affects the final capture.

Having said that, there are two filters which can't be reproduced in the post-processing: neutral density filters and circular polarizing filters. Neutral density filters allow you to use a shutter speed that you would otherwise be unable to use - and circular polarizers allow you minimize glare.

In both cases, the filters will cause some color shifting - and cheaply manufactured filters are notoriously the worst. I found this K&F circular polarizer to exhibit minor shifting which is difficult to perceive for online work - and can be adjusted easily using a color checker like x-rite in post if precise color is desired.

Filters that have minimal color shift tend to be very expensive - and therefore K&F's offering helps to stretch your photo dollar with only a minor level of inconvenience. The construction is good and the filter is thin thereby helping to minimize vignetting - though you can help minimize vignetting by simply ordering a larger size filter along with a set of step up/down adapters.

Overall I give this five stars for a superior product at this price point. Recommended!