The Effects of Focus Settings on S/N and FWHM for Stars in a Crowded Field

Details The Effects of Focus Settings on S/N and FWHM for Stars in a Crowded Field The Effects of Focus Settings on S/N and FWHM for Stars in a Crowded Field

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001phot.work...71m&link_type=abstract

Third Workshop on Photometry, p. 71

Physics

Signal To Noise Ratios, Focusing, Crowding, Photometry, Image Filters, Air Masses, Cameras, Charge Coupled Devices, Field Tests, Rations, Star Distribution

Scientific paper

Focusing tests of the Vulcan Photometric Planet-Search Camera using standard V, R, I and clear filters are used to determine the effect of focus setting on both signal/noise ration (S/N) and full width at half maximum (FWHM) of star images in fields with different degrees of crowding. These four filters, in addition, were studied to determine which produced both the maximum S/N and minimum FWHM for stars near the center of the charged coupled device (CCD) frame. MIRA software was used for the photometric reductions, and air mass was not accounted for in this study.

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