spectrographs and focal ratio

Forums Spectroscopy Focal reducers for Alpy! spectrographs and focal ratio

David Boyd

Hi Steve,

My inclination would be to run your setup without a focal reducer to avoid adding more chromatic aberration and see how that works in practice. That also avoids the problem of having to get the spacing just right for the focal reducer. As a general rule, I like to keep things as simple as possible consistent with getting good results.