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[ATM] Zernike (or Lyot) phase contrast tests
Hello Nils Olof,
There are two types of line filters for phase contrast
The one I made with the Technical Pan 2415 works pretty good.
Another one is made and used by the French optician David Verneth
This one is a small glas plate with a small 0.1 mm thin transparent
line with chrom and it reduces the direct light to 1/200 of the value.
My film filter works much better than the glas plate filter. I don't know
whether the unsharp edge is the reason for that or not - but it works
and there is an additional Foucault-effect.
Best regards Wolfgang Rohr
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