This is what a Moire Tell Tale looks like. If you don't see the patterns, it is because you don't have Java enabled in your web browser.
You can get a Java run time environment from Sun at:
http://www.java.com/en/download/index.jspThere are instructions for setting up your browser at:
http://java.com/en/download/help/5000020100.xmlThe co-ordinates show how sensitive it is. Move the scroll bars to apply a displacement.
This photograph was taken in poor light from 35m away using a hand held digital camera and a tripod mounted telescope. It is out of focus and blurred by camera shake but can still be read to 0.1mm. Try it.