Re: [ATM] figuring 10 inch mirror

[Mark Holm <mdholm@telerama.com>]

Here is an interesting thing.  I tried "masking off" the outer 5
millimeters of radius (10mm diameter) of Wayne's mirror in Sixtets  on
the assumption that getting rid of that much of the turned edge would
make a significant improvement in Strehl.  Surprise!

http://www.atmlist.net/contrib/mdholm-at-telerama-dot-com/W_Hillard_7-22-05_Sixtests_Para_masked.jpg

Although the turned edge is greatly reduced, the Strehl hardly budged.

Perhaps we need to be more careful with the old advice to mask off
turned edges.  Maybe it isn't the cure-all we have all assumed.

Also, Wayne, if you follow Jim's advice to do multiple Foucault reading
sets, you may find my program FrontSix useful.
http://www.atmsite.org/contrib/Holm/frontsix/frontsix.html
It lets you type in the readings spreadsheet style, then does all the
math and spits it out in either Sixtests or FigureXP format.  You can
even start Sixtests or FigureXP right from FrontSix. (You do have to
tell it the path.)

Sixtests is at http://home.earthlink.net/~burrjaw/public/win6.zip

FigureXP is at http://lerch.no-ip.com/atm/FigureXP_Full.zip

Andreas Reifke's program, Foucault Test Analysis, also processes
multiple test data.  Andreas borrowed Jim Burrows' math from Sixtests.
The results of the two programs are nearly identical, but they have
different feature sets.
http://www.foucault-test-analysis.de/

-- 
Mark Holm
mdholm@telerama.com

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