Re: [ATM] 7 inch sphereical mirror

["David Harbour" <stainless_steel@suddenlink.net>]

Dale, David, all:

Looks finished to me, according to this info, shown here in graphic form. My 
buddy, who finished his first 'scope with a spherical 7" mirror, was 
ecstatic at its performance. It looked pretty good to me, too.

R-101
----- Original Message ----- 
From: "Dale Eason" <atmpob@yahoo.com>
To: "David Rowe" <atmlist@starryridge.com>; <atm@atmlist.net>
Sent: Saturday, April 12, 2008 10:52 AM
Subject: Re: [ATM] 7 inch sphereical mirror


> This is a good opertunity to verify my idea of how I
> got the numbers using OpenFringe and Zernike terms.
>
> Using openfringe I setup the mirror to be 7 inch
> diameter and 140 inch ROC.  Then I set all of the
> zernike terms to zero.  I turned on the artificial
> null as in testing using the Bath at ROC.
>
> The profile graph shows that everywhere the error is
> less than .2 on the wavefront the RMS is 1/21 wave.
>
> Does what I did sound right?  The Foucault and Ronchi
> simulations show the mirror to be a perfect sphere.
>
> Here is the start test PSF and MTF
> http://www.atmlist.net/contrib/atmpob-at-yahoo-dot-com/7inch_sphere.jpg
>
> Dale Eason
> --- David Rowe <atmlist@starryridge.com> wrote:
>
>> Howdy,
>>
>> At optimum focus I get an RMS diameter of ~ 9
>> microns.  A little
>> parabolizing would be useful for this mirror.
>>
>> -- Dave Rowe
>>
>> -----Original Message-----
>> From: atm-bounces@atmlist.net
>> [mailto:atm-bounces@atmlist.net] On Behalf Of
>> Richard
>> Sent: Saturday, April 12, 2008 7:00 AM
>> To: Dale Eason
>> Subject: Re: [ATM] 7 inch sphereical mirror
>>
>> Hi Dale,
>>
>> Saturday, April 12, 2008, 5:57:08 AM, you wrote:
>>
>> DE> using OpenFringe...  The RMS error is 1/21 wave
>> and the
>> DE> strehl is .92.
>>
>> Zemax is considerably less optimistic. On axis spot
>> size is 17um RMS
>> with a 6.7um Airy disk. On axis Strehl is 0.25.
>>
>> -- 
>>
>> Best regards,
>>   Richard in the UK
>>
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>
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