Canon EF-EOS R Mount Adapters
Professional mount adapters for using EF/EF-S lenses on RF cameras – Multiple options

Turtledove Diffusers: Canon MT-24 EX Twin Lite Flash2 × $79.00
Macropod PRO 3D & Micro Kit R53 × $46,910.00
Macropod PRO 3D & Micro Kit R5 Educational1 × $43,960.00
Diffuser for Canon M-PE 65mm 1-5x1 × $49.00
Ruby-throated Hummingbird Tail Feather: 3D Model1 × $59.00
Adapter Plate for Fixing Rotary and Translational Stages1 × $129.00

Professional mount adapters for using EF/EF-S lenses on RF cameras – Multiple options

Canon Tripod Mount Ring and Adapter for RF 100mm f/2.8L Macro IS USM Lens
The base plate is designed to fix the x, y translational stage (not included) and the rotary stage (not included) to a sturdy platform. 
5mm Scale, 027 (calibrated to 0.1mm, 5mm range)

The L base plate is designed to mount samples to the x, y translational stage (not included).

X, Y Translational Stage for Micro/Macro Panoramic Imaging