[ATM] A ronchi question

[Don D'Egidio]

Another option would be to copy the pattern to a drawing program for reducing and print it out on 
transparency sheet with a printer having at least 1200dpi capability.

Don

----- Original Message ----- 
From: "Jeremy Royston" <jroyston at gmx.de>
To: "David Davis" <vorblesnak at gmail.com>; <atm at atmlist.net>
Sent: Thursday, March 10, 2011 6:39 AM
Subject: Re: [ATM] A ronchi question


> Hello David,
>     There's a program for drawing inverse Ronchi gratings 
> <http://www.atmpage.org/contrib/Holm/invron/invron.html>
> You need a slow (ISO 25 or 100) high contrast b/w film and a camera - non-digital cameras have 
> almost died out and the film is only available from professional photo shops. It's better to 
> develop the film yourself. I have the equipment, but haven't made such gratings yet - my 
> hobbyhorse is 2D-Hartmann
>
> Best wishes, Jerry
>