[ATM] 8" F/4.2... Done?

[Jason Hissong <jhissong@gmail.com>]

Hi guys,

Well, after working on my mirror, here is the latest figure:

http://www.undermidnight.com/images/atm/12052005_figureXP_final.jpg

Here are the ML readings...
http://www.undermidnight.com/images/atm/12052005_figureXP_final_ml.jpg

Zone    Ideal    Actual    Delta    Correction
2    0.024    0.015    0.015    63%
3    0.048    0.042    0.027    113%
4    0.072    0.066    0.024    100%
5    0.096    0.084    0.018    75%

The ML shows problems, with an RTA of 2.6.

The P-V Wavefront shows 1/5.52
Strehl shows 0.927
Surface RMS of 12.1

Should I continue to improve the ML readings?  The edge is stubborn and 
I think the Acculap has something to do with it.  It is difficult to get 
zone 4 and 5 to correct.

Should I leave it as is and trust the the surface RMS error?
I did 2 readings to get this result.  I will test again this evening to 
see if they show relatively the same values.  I did some "what-ifs" 
(with the numbers) to see if I did one more round of 4/5 D Ws even 
parabolizing strokes, to deepen it somewhat.  Or should I go with a TOT 
approach to flatten it out some and then do some MOT to deepen it?

Getting so close and I am afraid to do much else with it.   I have yet 
to do a serious star test because I don't have a center "dot" on the 
primary to collimate it properly.

Best Regards,
Jason Hissong

-- 

"A long journey starts with the first step and an understanding spouse."
http://www.undermidnight.com - astronomy and astrophotography
http://www.n8xe.com - ham radio
http://www.jasonhissong.com - electronic music composition

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