Re: [ATM] Dominic-Luc Webb's Question about Big Spheical Mirror

["David Sleeter" <d.sleeter@adelphia.net>]

In a previous ATM post, Dominic said:
>
> Getting to basics, could the poster confirm that he actually does
> have an actual "spherical" mirror and not some other (parabola,
> hyperbola, etc). It makes all the difference in the World here,
> and we recognize that Cassegrains have different configs. Also,
> please confirm that the mirror (and not the optical system) is F/2.5.
>
Having decided to sell the mirror, I've had it tested on a Fizeau
interferometer at a lab in Arizona. Its diameter is 16.5 inches, and its
focal length is about 41 inches, and that makes it an F-2.5. Regarding its
figure, peak-to-valley it's within 0.396 wave of a perfect sphere. Though
ATM-list protocol prevents me from posting sales links here, anyone who's
curious about this mirror can contact me separately at
d.sleeter@adelphia.net. I'll email you the link to a webpage with complete
photos and interferograms.

David Sleeter


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