Photovisual magnitudes are obtained for galaxies in the rich, compact cluster A2670, and also for galaxies in the surrounding field, on the system of extrafocal photographic photometry defined by Abell and Mihalas. The luminosity function, corrected for the field, is in good agreement with that found by Oemler with a different technique and in a different spectral bandpass, and matches that found by Abell for galaxies in the Coma cluster. Comparison of the luminosity functions of Coma and of A2670 suggests relative distances for those clusters that are in the same ratio as their redshifts, within the uncertainties of the corrections for galactic extinction. The total luminosity of cluster A2670 is estimated to be 7 x 1012 L0. Subject headings: galaxies: clusters of - luminosity function
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Mottmann et al. (1977) studied this question.