In very limited quantities, I have a few of these printed up (from my 3D Printer).
This will allow you to use a Carson 5x magnifier on the following mirrrorless cameras:
•All Sony Alpha Cameras
•Canon EOS R,RP,M50,R5/R6
•Panasonic GH4, GH5, S1
This is for the loupe extender only, the Carson magnifier must be purchased separately: the Carson Magnifying Loupe