Testing optical flats - The Raleigh Water test
Posted 28 November 2010 - 05:04 PM
link on the front page, then I click on link to this article,
the link doesn't work.
Posted 28 November 2010 - 07:04 PM
click on the above link; then click on "download this article" to see and copy the "PDF"
Posted 05 January 2012 - 03:19 PM
In fact, the Ritchey-Common test can provide excellent information for 'localized area' if, instead of a point source, a diffuse light source and a Ronchi screen or a Foucault test are used.
The Ritchey-Common test is a comprehensive quantitative and qualitative analysis tool if you have a single piece of optics of unknown radius of curvature, and have no master flat to check it against.
Posted 20 August 2014 - 11:14 AM
I agree with Mladen. I know that Bob Royce has made some large flats using the Ritchey-Common test.