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I've made plenty over the years. On a reflector it means no diffraction spikes. On bright objects it works well. Also great on bright close doubles such as antares/Sirius, makes them easier to split. If you make a three holed one avoiding the spikes, one can experiment with ie: having all 3 open, 2 open 1 closed etc. My best views of jupiter on my 12.5" reflector comes from 1 hole closed in a 3 hole mask.
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