Re: [ATM] Couder Masks and Zone Testing

[Mark Holm <mdholm@telerama.com>]

The program CouderMask does not use Postscript.  It prints directly from 
a Windows 95 or higher system to a Windows compatible printer.  A mask 
for a 150 mm diameter mirror will fit on one page of 8 1/2 x 11 inch 
paper.  You have to glue it to a suitable backer and cut out the 
openings.  (I have been known to use Cheerios box cardboard.}

CouderMask draws it's mask openings as diameter segments, not parallel 
arcs.  (It even draws neat arc's where the line and curve segments 
meet.  You don't really have to cut those corner curves exactly.  You 
can square them off, or just cut a straight diagonal across them.)

CouderMask defaults to using mask openings and effective radii (h sub m 
in Texerau) calculated according to the analysis performed by Nils Olof 
Carlin   http://www.atmsite.org/contrib/Carlin/couder/   This is 
probably the best analysis of Couder mask dimensions available easily to 
atm's.

CouderMask defaults to drawing masks that are laid out similar to 
Texerau's, but there are some options for different layouts.

CouderMask will print out mask dimensions so you have documentation.

CouderMask's author is usually available on this list, or by private 
email to answer questions.  (Except he will be on the other side of 
Pennsylvania this weekend.)

Find CouderMask at:

http://www.atmsite.org/contrib/Holm/coudermask/couderma.html

Mark Holm
mdholm@telerama.com

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