Binocular Optics and Mechanics

Part of the Patrick Moore’s Practical Astronomy Series book series (PATRICKMOORE)


There are three main parts to a binocular’s optical system:
  1. Objective lens assembly. Its function is to gather light from the object and form an image at the image plane.

  2. Eyepiece lens assembly. Its function is to examine the image at the image plane, rendering it visible to the observer’s eyes.

  3. Image orientation correction. In modern binoculars this is usually a prism assembly. In large binoculars this may also require the eyepieces to be at 45- or 90- degree angles to the main optical tube. Binoculars are usually classified by the type of prism assembly they use (e.g., “Porro prism binocular” or “roof prism binocular”) (Figure 2.1).



Spherical Aberration Chromatic Aberration Aperture Stop Exit Pupil Uncoated Glass 
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© Springer-Verlag London Limited 2007

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