From: Paul Cousoulis 
To: atm{at}shore.net
Reply-To: Paul Cousoulis 


I don't understand. Taper what? The tube opening or the mirror itself?

Paul

Richard Schwartz wrote:
>
> And to carry your argument further, a refractor with NO central obstruction
> might do even better.   But even this can be improved on by APODIZING:
> instead of a sharp chop off of the aperture at the edge, have a gradual
> tapering.  That will take light out of the first ring and put it into the
> center (while making the center slightly larger).  The result should be
> improved ability to see low contrast dark features on a bright background at
> the highest possible powers.

--- BBBS/NT v4.00 MP