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[ATM] Figuring flats

Hi,

            I?ve made some progress in figuring my 10? flats and have
knocked up a page showing the results of my efforts. At Mike?s suggestion I
concentrated on figuring just one plate at a time rather than all three
together and also increased the length and width of my stroke to ½W x ½
side-to-side. The results amazed me! I now have one plate around ¼ fringe
(or 1/8 wave at 589nm) from flat and have started work on the next plate. I
was worried that I would end up with TDE with such a long stroke, and indeed
it did show up briefly on one plate, but I think I have it licked. I can see
no trace of TDE in the later interferogram images. If anyone spots any
errors in my calcs or work then please let me know!

            Phil.

http://ochra.110mb.com/figuring_log_for_10.htm


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