Re: [ATM] 7 inch sphereical mirror

["David Harbour" <stainless_steel@suddenlink.net>]

Dominic, all-

I have always wanted to build a lenseless Schmidt, or Wright camera, driven 
by a threaded rod drive. So many plans; so little time.

Too late now; it's okay; I will experience what you guys experience, if you 
will only continue to write about it!

R-101

----- Original Message ----- 
From: "Dominic-Luc Webb" <dlwebb@canit.se>
To: "Richard F.L.R. Snashall" <rflrs@rcn.com>
Cc: "ATM List" <atm@atmlist.net>
Sent: Monday, April 14, 2008 12:13 PM
Subject: Re: [ATM] 7 inch sphereical mirror


> 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
>
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> 


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