Everything you’ve ever needed to know about binoculars- in one handy place.
Following is a list of binocular terms, listed alphabetically:
Aperture – The size of the binoculars’ objective lenses. The second number represented in the numbers describing a set of binoculars, measured in millimeters. Example: In the Steiner 8×22 Predator Binoculars, 22 would represent the aperture.
Aspherical Lens – A lens with flattened edges, useful for a clearer, sharper image.
BaK-4 Glass – Premium, high-density barium crown glass that minimizes light scattering inside the binocular tubes and allows bright, crisp, clear viewing.
Center-Focus – A mechanism that allows both eyepieces to be adjusted at the same time, useful for rapid focus.
Central Focusing Wheel – A wheel mounted in the middle of the binoculars, allowing for focusing.
Coated/Multi-Coated Glass – Thin layer(s) of coating added to the binocular glass to help reduce reflections. Examples: (C) Coated optics – one or more glass surface is coated. (FC) Fully coated optics – all glass surfaces that have any vulnerability to air are coated. (MC) Multi-layer coated – one or more glass surfaces is coated multiple times. (FMC) Fully Multi-Coated – all glass surfaces susceptible to air are multi-coated. Continue reading