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My fl is 900mm. 90mm at f/10.

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With a 2400 l/mm grating, and 900mm focal length for the optics used in the spectroscope, I calculated that the linear dispersion would be 0.35mm/Angstrom. So if you want a bandwidth of 0.4A, the slit width would need to 0.14mm or 0.0055 inches. That is not difficult to do.

- Dave

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Homemade 'scopes 8"f/7,6" f/5", 6"f/4, 4.25" Schief. 60mm Coronagraph,60mm H-alpha system, 4.25" White-light Solar Newtonian,solar spectroscope, 4.5" f/16 Schupmann Medial refractor, 14 Stellafane awards 7 in optics

Engineering = Taking what you have and making what you need.

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