I`m using cages and lenses from beastgrip for many years and it is my preferred supplier for smartphonegear and over all I`m very happy with the products, they are one of the most professional gearsupplier in this smartphonemarket.
But: I have one issue with all my anamorphic lenses from beastgrip (mk1 and also the new mk2). After having screwed on the lens to the beastgrip pro cage, you need to adjust (rotate) the lens to the proper position. So far so good. But using e.g. a variable nd filter ...