Re: [ATM] Ronchi Confusion

[Dale Eason <atmpob@yahoo.com>]

The reference to curved lines are for when you are
testing in the shop using a source at the radius of
curvature.  For star testing a porabloidal mirror the
lines should be straight as the instructions say.

Dale Eason

--- Joseph Celmer <celstar@frontiernet.net> wrote:
> Hello ATM,
> This is my first post to this list.
> 
> I am confused about the Ronchi test. I have a
> grating from Orion 
> Telescopes & Binoculars (no longer offered). The
> instructions read as 
> follows. "Properly figured optics: With the
> telescope aimed at a star, 
> straight bands indicate a good paraboloidal mirror
> figure or a properly 
> corrected lens."
> 
> Almost all other references I find indicate that a
> spherical mirror 
> gives straight lines, a parabola slightly curved.
> Except, page 290 of 
> Harold Suiter's
> authoritative "Star Testing" book seems to agree
> with Orion instructions.
> 
> Am I missing something?
> ____________
> 
> Clear Skies!
> 
> Joe Celmer
> celstar@frontiernet.net
> http://www.frontiernet.net/~celstar
> 
> 		
> 
> _______________________________________________
> ATM mailing list http://www.atmlist.net/



	
		
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