Abstract

A plane-grating spectrograph using a movable calcium fluoride camera corrector lens has been designed and constructed. It can be used to cover a wavelength range from about 12 000 A to 1500 A. The dispersion is approximately 58 A/mm, in the first order. The camera focal ratio of f/2 gives the instrument a speed such that for relatively weak sources, the exposure times have been reduced from several weeks to a number of hours.

© 1957 Optical Society of America

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