Re: ATM Autocollimation Testing via Flats

["Jean-Guy Moreau" <jgmoreau@lino.com>]

> To locate the aberrant zones, you could probably use an ordinary Couder 
> mask.  I'm not sure how you plan to measure the surface quality of your 
> flat, but if you're good at mathematics, no doubt it can be done.  Good 
> luck with the project and please issue a final report to the list!  
> 
> Cheers,
> Roger Ceragioli
>

yes indeed, use a mask to figure a sphere too !!!
when you think you have a good null, put a a mask and measure a few "zones"
you will be surprised !   i was....

Jean-Guy