Canon Drop-In Filter Mount Adapter EF-EOS R with Circular Polarizer Filter

WAYYYYY too expensive. Not weather sealed. For R5 users, keep this in mind when shooting outdoors in wet weather. Your camera may be weather sealed, but this adapter negates that! Additional CLEAR drop-in filter REQUIRED in order to use without the PL filter. That's another .130! As for functionality, it works great. Communication between EF lens and camera is good. PL filter leaves a strange gradient at certain angles (?). Can't explain that. 3 stars because I wonder if 3rd party adapters WITH drop-in filters work just as good for about 1/3 or 1/4 of the cost??? I use this for business most of the time, so I want use native gear as much as I can afford. Canon's RF system is putting a dent in my wallet. To the point where I may not be able to afford native Canon gear anymore. May need to switch to 3rd party lens when they become available. For now, this adapter will save me money by using my EF glass.