best distance

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Robin Leadbeater

The best distance of the SA200 from your camera sensor for your setup would be about 30mm but you can use up to 40mm and still fit the spectrum and zero order horizontally. See the attached calculator output. Note that this camera has large pixels for your short focal length which means your images are probably under sampled (~3 arcsec/pixel)  This can also give problems with ripples in the spectrum as the thickness of the spectrum may be narrower than a single row of pixels.