My back focus must be affected, surely?

No.
Revolva compensates for back focus with its high refractive index rear optical window, combined with a precise and specific flange depth.
As long as you have a Revolva cartridge fitted, back focus will be correct.

Bear in mind that temperature, knocks and bumps and other factors can affect back focus for any given lens and camera.
Adjusting backfocus on RED is simple, so you should collimate prior to shooting whenever absolute precision is required.

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