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So you want a cheap spectroscope.
Here is a program with instructions to make an effective spectrascope. It was originally supplied by Meade to use with a 416 CCD on a LX series telescope. The program is shareware but you can try it for free. It is compiled basic so may not run on a 64 bit computer but runs OK on my XP.
You will need a CCD camera or similar and a good laser printer that can print the grating onto overhead projector film. I successfully printed out a 200 line/inch grating with a HP 5p laser printer but the overhead paper won't go through through my Konica
Unzip the program read the manual and look at the star spectra
Barry
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