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Hi Patrick,
I make rough sketches at the eyepiece plus copious notes. Then the following morning I make a more refined version (pencil on white paper). I invert them using an image manipulation program. For illumination I use a very faint red light. So faint that I have to hold it within an inch of the paper to see it at all. I use 4" diameter circles, and have to move the light around to illuminate each part of the circle I'm drawing in.
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