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Maurice,
Some excellent results there, well done!
John,
Unfortunately there are no current commercial spectroheliographs on the market.
There are 3D print plans available and a "set" of optics available from Shelyak in France.
My MiniSHG was made using unused 1 1/4" camera/ eyepiece adaptors, the 125mm lenses, a 2400 l/mm grating and a plywood box.
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