Re: [ATM] RE: Foucault Simulation analysis of non-symmetricaberrations

[Bernard Maugoust <maugoust@free.fr>]

In message <200409201645.AA613810466@mail.johnspics.com>, 
 "john sherman" <atm@mail.johnspics.com> wrote:

> I found a real nice way to make spots is to very lightly mist a microscope
> slide with a can of black spray paint. Magnification reveals a number of
> very round spots of various sizes. Just throw the thing up into your light
> path, and choose a size that works for your setup.

Thanks for that recipe John. That's also on your web pages that Tom
mentioned. What's NOT there though is the recipe for making the tiny *round*
hole. Would you tell us how you do those? I've only tried today alu foil
pierced by a needle on a not too soft surface (oak wood). I'll try other ways
and see what are the results on the tester when it gets darker (it's early
afternoon here now).

As my mirror under test doesn't look all that bad at all, I'm getting keen to
check its astigmatism as well. (It's an 8", 1075mm FL, F/D 5.3)

Regards,

Bernard

-- 
Bernard Maugoust 3°59'E 44°28'N

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