Mount ring for the Viltrox EF-R3 Speedbooster
thingiverse
I really liked the added versatility of Sigurd2's "Mount ring for Canon EF EOS R Adapter" so i designed a similar ring for the Viltrox EF-R3 (not the pro) speedbooster adapter. Printed with .2mm Layer height i had to sand the inside of the ring to get a tight fit but your mileage may vary since my printer does not have the best tolerances. The original arcaswiss mount holes and screws are used to attach the ring to the speedbooster. Use at your own risk, im not responsible for any damage done to your lens, adapter or camera.
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