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PI Physik Instrumente - Microscope Stages LB ROS 11/24
Photonics Dictionary

Huygenian eyepiece

An ocular having two planoconvex lenses that are formed from similar glass and that are separated by a space equal to half the sum of their focal lengths. This eyepiece is free of lateral chromatic aberration, but is not suitable for use with crosshair lines because the image plane falls between the two elements.
 
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