Hi Kevin , thats what I thought at first then it was pointed out to me that although the effective F ratio changes the mirror doesn't it's still a 8" F3 and this is what makes the difference, it would not be the same as a 5" F4.8 the FOV would be smaller in the 5".
I will see if I can find an artical I have on the Lenless schmidt design it explains it so much better than I can.
David.
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