A diminutive but technical definition of Exit Pupil is the diameter of the shaft of light (expressed in millimeters) that exits a binocular’s eyepiece that can enter through your eye’s pupillary opening. Exit Pupil is calculated by dividing a binocular’s aperture by its magnification, e.g. 42mm / 8x (for an 8×42 binocular) = 5.25mm.
Under bright [...]
Q: “What is that purple glow in my digiscoped bird images?”
The purple color anomaly along the right side of this Barred Owl is an artifact that occurs when the optical system fails to focus all colors to the same convergence point. It can appear visually when viewing through a binocular or spotting scope, as well [...]
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