Good to know binocular words, terms and definitions

APERTURE is defined as theamount of light gathering ability of binocular lens.  It is the size of the objective lens of binoculars.

BARREL is a type of binocular with one of two glass elements in each side of a binocular.

BINOCULARS are two hand-held optics mounted side-by-side and aligned to point in the same direction that you hold with both hands. You look through them to see things that are far away. Experts suggest for best viewing choose 7X, 8X or 10X magnification and 50  millimeters for front lens.

CENTER FOCUS is the knob between the two barrels of binoculars that allow both eyepieces to focus. It is also called the center focusing wheel.

CLOSE FOCUS is theclosest distance that binoculars can clearly focus with your   eyesight.

DEPTH OF FIELD describes the part of an image between the foreground and background that is in focus.

DIOPTER describes the adjuster on the right eyepiece of binoculars that compensates for differences between your eyes. The right eyepiece is also called the adjuster eyepiece.

EYE CUPS are rubber shields at the end of the eyepieces that protect your eyes and allows adjustment of the eyepieces.

EYEPIECE is thelens between the viewer’s eye and the final image, it is the back components of one barrel of a binocular.

FIELD GLASSES are a type of binoculars that uses a second lens instead of prisms.

FOCUS means a change in viewing distance so the image appears sharp

FOV is the abbreviation for field of view. It is the size of the image, the broad area  described as the edge to edge view that you see through binoculars.

IMAGE STABILIZED is a feature of binoculars that self-steadies an image.

INDIVIDUAL FOCUS is a feature of binoculars that focuses eyepieces separately.

LANYARD is a lightweight strap that attaches to binoculars and hangs around your neck.

MAGNIFICATION tells you how many times bigger you will see an image.

MONOCULAR is a handheld optic that is half of a binocular with one eyepiece that uses one eye

A MONOPOD is a single, lightweight support pole to stabilize binoculars and adjusts in height. Some have 3 feet and can stand alone.          

OPERA GLASSES are small, low powered, lightweight binoculars used in theaters and at events.

PORRO is a type of binocular prism with a traditional appearance.  It bends the light inside the barrels to produce the image and create clear vision.

POWER of binoculars is its magnification.

ROOF is a type of binocular prism that are more compact than a porro prism. The lens and eyepiece are in a straight line.

A SPOTTING SCOPE is a single optic with a powerful lens. A straight design has its eyepiece aligned with the lens. An angled design has the eyepiece set at a 45-90 degree angle.  

10×25 on binoculars defines its magnifying power and size of lens. The “10” is the magnification power and describes how many times bigger you see an image.  The “25” defines the size of the diameter of the lens measured in millimeters. 

A TRIPOD is a 3-legged support mount for binoculars and other optics and cameras used with an adapter to hold it steady and stable for hands-free viewing.

A SATELLITE is a man-made object in orbit around a planet.

SHOOTING STARS are meteors falling to the earth from space.

A STAR CLUSTER is a large group of stars bound together by gravity.

TWINKLING is how stars appear as pinpoints of light in the sky.

URSA MAJOR is the brightest stars that make up the Big Dipper.

URSA MINOR is known as Little Bear and often called the Little Dipper.

WANING is the moon changing from full to new.

WAXING is the moon moving from new to its full phase.

WIDE-ANGLE is a type of binoculars with a wider than 65 degrees field of view.

You might also be interested in:
Basics of how to use binoculars
Binocular Accessories
Choosing kids’ binoculars
Best Binoculars crossword puzzle
Gene and Katie
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