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Baffling a newt
Are there any good technical articles showing the formulae I can use to work out how close to the edge of the parallel light beam I can put baffles without impeding off-axis illumination too much?
I just bought a commercial newt with a rather small upper cage. My previous scope was home built solid tube and my backyard is not the darkest place.
I'll make a shroud, I'll flock opposite the eyepiece, but I wonder if a small baffle opposite the eyepiece might also help, casting a shadow over the field behind the secondary. I could easily make one using aluminium from a drink can, cut carefully into an arc to match the inside diameter of the tube, painted flat black then riveted into place.
Thoughts?
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