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Re: [ATM] ronchi accuracy
Guy --
Dales photos show the idea. The only drawback is that you have to make
a perforated flat of at least the size of the largest mirror.
Jan Bentz
Dale Eason wrote:
>See:
>http://www.geocities.com/stressedglass/2003atm.html
>in particular see image titled "Mirror testing using
>a double bounce technique" and the next image as well.
> The caption does not state it but they are looking
>though a ronchi screen and looking for perfectly
>straight lines when testing a perfect porabola.
>
>Dale Eason
>
>--- Guy Brandenburg <gfbrandenburg@yahoo.com> wrote:
>
>
>
>>Do you have any photos of such a setup?
>> Guy B
>>
>>Jan Bentz <jbentz@inreach.com> wrote: For teaching
>>purposes with a group of people nothing works better
>>than
>>the ronchi test using a perforated flat. No math,
>>no looking for
>>fringes, and if all have the same mirror, alignment
>>is easy.
>>
>>Jan Bentz
>>
>>
>>
>>
>>Guy Brandenburg
>>Washington, DC
>>My home page:
>>
>>
>>
>http://home.earthlink.net/~gfbranden/GFB_Home_Page.html
>
>
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