Abstract
This article deals with the use of objective gratings in contemporary astronomy. It is shown that their use in photometry may help considerably toward reducing the photoelectric effort in calibrating the magnitudes of faint stars. Their usefulness in dense star fields is also explained. The article contains a discussion of the precautions that have to be taken to ensure first-class results. The use of objective gratings in astrometry for the elimination of magnitude equation is explained. The effects of atmospheric dispersion in work with objective gratings are discussed.
© 1964 Optical Society of America
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