Fw: [ATM] over&under correction.

["Bill Kelley" <flex@commspeed.net>]

 I always star test and usually decide to tweak the figure. A flexed scope
 with a float glass mirror seems to need it out here in the Arizona desert
 and normal rapidly dropping temperature. I'm not sure that I see an image
 improvement. Old eyesight and poor observing skills might account for that.

 Bill Kelley

>>>> At 2005-07-10 06:32 -0700, John Moore wrote:
>>>>> Mirror A;is 1/4 wave-undercorrected.
>>>>> MirrorB;is 1/4 wave-overcorrected.

> John originally asked which would perform better under the stars.

 When cooling, mirror A will likely perform better, because cooling
 will cause the mirror to bend into a more corrected shape. If you
 observing in the evening, your mirror is likely cooling, so the
 undercorrected mirror will be closer to perfect, and the overcorrected
 one will be farther from perfect.

 Mike L.<

                               ---------------------------------------
>> YES!!,,,,that's the Ticket!!,,,good point Mike!,,that's what I was 
>> looking

 for,, I was curiouser about this point, because I was wanting to

 build an "Adaptive-optics"system, if you will,(flex-mir-sys) for my

 next project, and I wanted to see what the general-thought was

how the optical-train, reacts to difference in temp.change,if
the system is 1/4wave under.[yes i know that its suppose to
t spherical],,but my thoughts were for experimentation<<


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