Quote:
Originally Posted by Satchmo
There is no mystery about this. As far as I know those figures are for primary and secondary combined, as a functioning instrument. The Star Instruments web site , who make RC Optical instruments clearlys state that these wavefront figures are Root Mean Square, not P-V .
Clearly the lesson is to keep the obstruction to a minimum which generally visual observers, and planatary photographers have the luxury of doing.
Mark
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Thanks for explaining that again Mark. I couldn't find the thread last night to link to.
Ciao Mark