Call Canon Internal Parts directly in Chesapeake, VA 9AM EST to 6PM EST at 732-521-7007
There are 11 washers (shims) in total available from .03mm to .30mm. The part numbers are cb3-4823-000-003, 002…030. $15.10 for all 11 plush $6 S&H, VA residents pay sales tax.
My 5DMK2 was way off. It had two washers (thick and thin) and using both, just the thick, or just the thin provide varying degrees of front/back focus. I needed to use the thin one that came with my camera and the 0.06mm shim and I’m pretty spot on now.
