[ATM] Ronchi test accuracy

[Mike Lockwood <melockwo@uiuc.edu>]

Guy,

Guy Brandenburg wrote:
> Another problem with Texereau - he completely neglects the Ronchi
> test.  So do the LeCleires.

And so do I!  ;)   (This may be unfortunate for me!)

> I think it's important to supplement any given book with newer
> stuff from the web. One web resource I haven't seen mentioned yet
> is Peter John Smith's comparative ronchi testing pages. Also
> RonWin.

Seriously now, has anyone ever attached a figure to the accuracy
limits of these tests, that is, any type of new or old Ronchi test?

Maybe Mel can chime in here.

It's routine for me to confidently take Foucault testing to 1/10th 
wave wavefront error (confirmed by later star testing).

How far can Ronchi (by itself) go?

	Mike Lockwood

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