[ATM] Nasmyth secondary mirror cell

[polaraligned <polaraligned@optonline.net>]

Hi Don,
Have you tried the folded Newtonian design spreadsheet at:

http://www.oldham-optical.co.uk/index.htm

Some good stuff.

Scott




>
> Message: 7
> Date: Thu, 27 May 2004 16:03:34 -0400
> From: Don Anderson <donanderson@direcway.com>
> Subject: [ATM] Nasmyth secondary mirror cell ?
> To: The Amateur Telescope Makers List <atm@atmlist.net>
> Message-ID: <004301c44425$b6e5f8e0$0300a8c0@hewlett63wy6j1>
> Content-Type: text/plain; charset=iso-8859-1
>
> I am trying to design (before attempting to grind and build) a Nasmith
Dob.
> I will have a 22 in.f/6 primary, an 8 in. secondary, and a 2+/- in.
> tertiary.  The secondary will be as optically flat as I can manage and
will
> be perpendicular to the optical axis, thereby avoiding astigmatism.  I
have
> thought of two designs for the secondary mirror cell.  I am not satisfied
> with either and am open to suggestions.  The designs are:
> 1. full thicknes mirror glued to the cell with clips for safety.
> 2. the mirror face sitting on three pads which are supported from the
sides
> with a sling to support the mirror on the side.
>
> I am interested to hear any comments about these and/or a suggested
design.
> Don

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