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Re: [ATM] Simple Formula

Focal length is one half the ROC or 44.69 inches.

Ken Hunter


--- nunya <ntent@pctcnet.net> wrote:

> Hello, All: With all the info I have on my disk (8
> megs) I simply cannot
> find the formula for determining the focal length
> for my (newly coated) 6"
> mirror.  The pertinent info I have from the test
> sheet is as follows:
> optical diameter = 5.83  ROC=89.38  The listed F\D
> is 7.67  I would like to
> verify this before I begin designing the rest of the
> OTA. I also have the
> Zonal results and wavefront data, which I would like
> to send to anyone,
> off-list, who could verify the
> specifications\quality of the figuring.
> Thanks, in advance.   Clear skies to all.  John    
> 45.69 degrees north
> 90.39 degrees west
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
> 



		
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