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Iv'e reread Gregs and your post and can see the sense in which you were quoting this SA figure ( ie no `inherent' spherical aberration in an RC) .
I would be interested to know some time the quoted total system RMS accuracy. . As I've expressed the sharpness of your photos is not down to a small SA term or otherwise as the central obstruction will significantly degrade the finest optical system but it all helps.
Sorry for the hijack Daniel, very promising first light.
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