Abstract

This article describes a new series of photomicrographic field-flattening eyepieces, designed to compensate the residual aberrations of microscope objectives notably flatness of field and lateral color. The systems are negative in power, and strictly speaking, are not “eyepieces” since the pupil is internal, preventing direct visual use, but they are directly interchangeable with conventional visual eyepieces in the microscope and yield a large and well-corrected image for photomicrography and microprojection.

© 1954 Optical Society of America

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Figures (3)

F 1
F 1

The new Ultraplane construction compared with its predecessor, the Ampliplan, and also a typical visual eyepiece.

F 2
F 2

Calculated field curvature data on the 3 Ultraplanes compared with 3 typical objectives.

F 3
F 3

Comparison photomicrographs taken with 16-mm, 0.25 N.A. (numerical aperture) objective using: (1) Ampliplan (small, but flat field); (2) Huygens (large field, but field not flat); (3) Ultraplane (large flat field).