Other
Scientific paper
Oct 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975orion..33..151d&link_type=abstract
Orion, vol. 33, Oct. 1975, p. 151. In German.
Other
Light Scattering, Optical Correction Procedure, Optical Filters, Stellar Occultation, Telescopes, Antireflection Coatings, Eyepieces, Focal Plane Devices, Visual Fields
Scientific paper
The paper makes suggestions as to how to reduce as much as possible the effect of light scattered and reflected in the telescope and eyepiece during observations of the occultation of a star at the dark side of the moon. One technique is to dim a part of the field of view of the eyepiece with a red or neutral grey filter, at the same time placing in the focal plane of the objective lens a circular gelatin filter on mirror glass whose coating has been reduced to one-third its thickness by sharp cutting and scraping. Another technique is to use, in addition to the previously described filter, a thread placed in the image plane perpendicular to the filter edge. This thread, when oriented parallel to the path of the star in the moon-fixed image, as predetermined through ephemeride calculations, helps block out blinding moonlight.
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