Abstract
As part of an investigation into the effect of atmospheric refraction on measured stellar positions, the effective wavelengths of the 24-inch refractor at Sproul Observatory (van de Kamp 1962) for spectral types AO V and M2 la and various emulsion-filter combinations were computed. Of particular interest was the change of effective wavelength with a change in exposure, an effect first noted by Bergstrand ( 1905 ) . Account was taken of the energy distribution of the star (Code 1960), the absorption of the filters (Eastman Kodak 1938, 1951), and the sensitivity of the emulsions (Eastman Kodak 1948, 1963 ) . Effects of atmospheric extinction, the transmission characteristics of the 24-inch lens, and the focal curve of the telescope are considered negligible since the effective bandwidth has always been less than 1200 Â. Precise focus is difficult to define and main-
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