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High Brendan, To my way of thinking absolutely nothing to do with the F ratio or magnification will change due to the fact that the mirror is configured and ground as a 10". The curvature and focal distance will not change. The amount of, or ability to grasp light will however change and the image circle will also be reduced giving a black or at least false border to the image. (vignetting)
Just my thoughts, no science involved.
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