Abstract

The effects of blur and overlap on heterochromatic brightness matching with a bipartite field have been investigated. In particular, attention has been paid to the role of chromatic aberration of the eye in producing blur and separation or overlap. The effect of blur is relatively small, but this source of error can be eliminated by using an achromatizing lens to compensate for axial chromatic aberration and by using separate aperture stops for the two beams. Overlap and separation can be avoided when a bipartite field is used by controlling the position of the eye so that the two beams both pass through the center of the pupil. A more important question, however, is whether the deliberate use of a black bar to separate the two halves of a bipartite field can improve the validity of the measurement.

© 1974 Optical Society of America

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