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Thank you Dave, Since I am using a grating and long fl optics the dispersion is high. However, are they linear?

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A grating has a linear dispersion and prism does not, this is one reason why gratings are used over prisms. So your scale in your eyepiece would be linear. Remember that the movement of the grating as a function of angle is not linear with wavelength and follows a Sine function so any type of wavelength readout dial needs to correct for this.

- 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

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