I have the same question as I just read on a previous post. Just completed a faucault tester and the exact position of the light source is not clear on many examples. Some use a torch light some distance to the side, some use a light on a fixed post separate to the knife edge. I have used a LED light as per the Stellafane models shining through the bottom, middle of the 2" slide hole close to the knife edge.
Last edited by nobby2; 09-01-2017 at 04:48 PM.
Reason: I was expecting it as an answer to a specific thread and found it out alone with not explanation.
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