Cpl, Filters, Magnetic Filters, Photography, Review.
the best firmness/usability, closely followed by Kase. K&F Concept and Haida are weaker, but probably still usable. VFFoto was tested only on 49 mm and with this diameter it is too weak. I don't have a proper explanation why the Freewell was 0.1 stop darker in the real life scene when no such trait