Re: [ATM] Off-centered Mirrors?

[Ken Hunter <atm_ken_hunter@yahoo.com>]

The coma is contributed by the photons that are coming
off-axis to the Parabola. In the case of a mirror like
you describe, you would get the same coma (but less
light) than you would from the original mirror.

Ken Hunter

--- DHA352@aol.com wrote:

> Bob May wrote:
> ... Essentially, you have the coma of the larger
> scope in a small scope.  ...
>  
> I had always thought the coma from a large scope was
> from its small focal  
> ratio < f/4.5 not it being large.  Am I wring?  I am
> thinking of an  f/6.
>  
> Don
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> ATM mailing list http://www.atmlist.net/
> 



		
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