There are a lot of filter systems, and among the more experienced photographers, you will hear them talk about brands like Urth, NiSi, and K&F. Kase, which has become quite popular because of their magnetic system. Rather than having an awkward attachment or having to be constantly screwing filters on or together, their system has on simple magnetic screw mount, onto which you can magnetically attach one or many filters. This simplicity has attracted several professional photographers to their system.
