On 09/01/2008, at 12:54 PM, Chuck Norcutt wrote:
> I could hypothesize that the front element is actually a Schmidt
> corrector plate to correct the coma of such a fast optic. The
> characteristic of a Schmidt corrector is that it looks nearly flat to
> the eye but isn't. The front is flat but the back side has an
> extremely
> shallow sinusoidal-like curve. Commonly used in Celestron and Meade
> catadioptric telescopes for the correction of coma in fast, spherical
> mirrors. I don't know of any cases where a Schmidt plate is used in
> conjunction with all-refracting optics but I don't see any reason
> why it
> couldn't be. That's my 2 cents.
If you're using words like catadioptric and sinusoidal, that's at
least $10.02 worth!
Andrew Fildes
afildes@xxxxxxxxxxxxx
www.pbase.com/afildes
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