Re: [ATM] Ronchi challange

[Dale Eason <atmpob@yahoo.com>]

Ok how many lines would you like?  Others in the past
have said that the three line image is the most
sensitive for determining many figure faults.

>From what little I know about this I think what you
loose with the clipped images is the edge condition. 
Is that right?

Unfortunately that is best I can do with the camera
and lens I use.  I'm using my robo Foucault test
platform and camera so that I can accurately place the
ronchi screen.  

I wonder if anyone can determine the approximate
correction from the image.  I did.  I wonder what
others can do.


Dale Eason

--- hermit <hermit@outofoptions.org> wrote:

> Dale Eason wrote:
> 
>
>http://home.comcast.net/~doeason/rc/100lpi_outside_p150.jpg
> >
> >  I know some important info may be cut of at the
> top and bottom. 
> >  
> >
> Drop the may be and you have an accurate statement.
> ;)
> 
> Also, some pix with more lines are useful.  I find
> the 'few line' images 
> good for surface roughness and turned edge.  So,
> when you cut off the 
> top and bottom of the center fringe, you do lose a
> lot.
> 
> Ken
> 


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