[ATM] Over-shot Long. Aberration
wa4guu at verizon.net
Thu Oct 1 07:51:49 JST 2009
Yep it is over cooked.
There are an number of ways to back up. One would be to use the 1/3 D
strokes near Center over Center.
From: atm-bounces at atmlist.net [mailto:atm-bounces at atmlist.net] On Behalf Of
Sent: Wednesday, September 30, 2009 6:20 PM
To: atm at atmlist.net
Subject: [ATM] Over-shot Long. Aberration
I'm making my first mirror, Finished polishing, got a pretty nice sphere (I
think) and started figuring. I'm using a slitless tester (moving light
source), all was going well until in dawned on me that I need to double my
knife edge readings!!!! Duh!!! Now I think I have over shot my "ideal"
longitudinal abb. by a considerable amount! What can I do? Here are the
numbers for my mirror:
Zone 1 Radius=1.47
Zone 2 Radius=2.60
Zone 3 Radius=3.37
Zone 4 Radius=4.00
KE Readings on each zone
I hope I can fix this, I don't want to continue until I get some advice from
some veterans. Thanks guys!
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