Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jbaa..114...73l&link_type=abstract
Journal of the British Astronomical Association, vol.114, no.2, p.73-77
Astronomy and Astrophysics
Astronomy
Scientific paper
An extended object and a point source test pattern were observed through a range of apertures simulating exit pupils of different sizes. Clarity of vision was found to vary as a function of 'exit pupil' size and the nature of the test object. Optimum definition was obtained with apertures of about 3mm for extended objects and a little less for point sources of moderate brightness. Bright point sources were more poorly resolved at all apertures because of glare. The results are indicative that low power instruments with exit pupils around 3mm and of relatively modest aperture, will yield superior definition than larger instruments of similar magnification. At higher powers small aperture instruments (within their diffraction limited capabilities) would also be expected to give better definition of bright double stars than larger instruments at comparable magnifications.
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