Lyot Test with a thin soot filter line
Rauhheits-Test für Optiken
more links about Lyot test:
Herbert Highstone gave me the idea, to make a small line filter from soot. This one you
need it for the Lyot or Phase Contrast test. There are different ways to produce that
line filters: with a negative film TP 2415, with an overcoated line with the density d=2.16,
and at last with soot and a mask, to produce a small line on a glas plate.
The following shows the steps.
This is the soot line filter on a glas plate
This is the mask. You put the glas plate on it and fix it with a holder, because it will
become hot with the candle light
All three parts. In the middle the mask from the backside with soot and the candle
for getting the soot. In this way you can produce filters on a glas plate for watching
the sun, but we just need a small filter line.
This shows the light split and the filter line.
An exposure with this soot filter line
This is one with the film negative filter line. Now with some more experiences lets
find out how much is the density of that filter and how thin it must be for optimum.
Best regards with your own experiences! Would you kepp me informed?