[ATM] baseline roc on a mirror with lost data..
princenorman at bellsouth.net
Thu Apr 19 09:13:50 JST 2012
Its been a long time since I posted for various reasons but now I find myself in a terrible place.
I took a loooong time off on the 12” f/5 I am making, and in that time my computer went belly up with all the spreadsheets and data with it. (lectures about backing up your data aside..........)
so, my question is how do I find a Zero point Roc in order to process my Couder results given that the average r for the center zone is not zero?...that is to say..how do I come up with a Zero from an Roc that I cannot measure as a sphere since I have already started parabolizing, and no longer have a sphere, with the additional caveat that all my original data is lost? (and that I still want to achieve the desired goal...a 12” f/5)...I can’t exactly say that what I ground and polished is EXACTLY what I was shooting for...it could be anywhere from an f/4.9 to a f/5.1 and those are silly numbers (and for that matter I couldn’t care less...I’m going for mighty close..not exact..I’m aiming only for Rayeidh Standard)...they could be BIGGER!!!!!! deviations...uhg.
Your faithful enthusiast, and biggest dullard lurker that tries!
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