I know the two popular brands seem to be Skyreat and Freewell, but I discovers this other brand called K&F Concept. They are a well known brand for professional level DSLR cameras not usually for drones. I wonder if they might be better because they are in the business of making actual filters. Skyreat and Freewell seem like they were born out of the Drone industry instead of film or photography. What do you guys think?