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Focusing the Spectrograph

The reimaging optics tower has a temperature-sensitive focus that has been mostly eliminated by a temperature-controller device now wrapping around the reimaging optics. Thus there should be no need for the observers to focus the spectrograph onto the aperture masks. If the focus appears to be poor you should contact an appropriate Palomar staff person, or one of the instrument builders, for advice. It is very easy for an inexperienced person to destroy the optical alignment of the instrument, so the procedure is not described here.

Roy Gal