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I guess the RCC might be the way but I wonder if there'll be vignetting as you're moving the 2" CC further down the optical path with the RCC's 94mm and you would've had to move the primary up to get back focus, so slightly stumpier light cone, not sure if there's a way to calculate its width at the front face of the CC.
Else a flat might show vignetting if any. Again, at F6 you might not have any issues.
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