Re: [ATM] 7 inch sphereical mirror

[Dominic-Luc Webb <dlwebb@canit.se>]

On Mon, 14 Apr 2008, Richard F.L.R. Snashall wrote:

> > well. This scope is in the range of a lensless Schmidt, and
> > there are some very impressive images out there of objects like
> > Andromeda galaxy covering something like 3 degrees of sky.
> At 21 mm off-axis (0.6767 degrees), I get the Visual Strehl of
> about 0.34 and at the 70.7% point of that, about 0.58.  The
> "diffraction limited" field (0.80) is about 0.5 degree diameter.
>
> Of course the field is convex to the viewer, so there may be
> additional losses due mismatch with the eyepiece.


This design is also stopped down.

Dominic

_______________________________________________
ATM mailing list http://www.atmlist.net/