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Magnification describes how many times closer an image appears. Magnification is also called “Power” and is abbreviated by the symbol “X”. A magnification of 20 (20 power) means that an object appears twenty times closer than you would see it with the naked eye.

When looking through an optic with a magnification of 20, an object at a distance of 100 yards/meters appears to be only 5 yards/meters away.

Actual field of view is the view when looking through an optical device indicated by the angle from the center of the objective lens. An optical device with a wide angle of view makes it easier to find an object. In general it is more difficult to find an object with an optical device with a higher magnification.

The measurement in mm of the diameter of the objective lens of an optical instrument. As the diameter of the objective lens increases, the optic will have better light gathering and higher resolution.

Exit pupil is the bright circle that is visible when the ocular lens is viewed at a distance of about 25cm (10 inches) with the objective lens facing towards a bright background or light source. The larger the exit pupil, the brighter the image will be under low-light conditions.

Exit pupil = Objective lens diameter ÷ Magnification

Relative brightness is a number used to compare the brightness of binoculars or spotting scopes of similar magnification. The larger the relative brightness number, the brighter the image.

Relative Brightness = Exit Pupil2 (or Exit Pupil size in mm, multiplied by itself).

Eye relief is the distance, measured in mm, between the eyepiece lens to where the exit pupil is actually positioned in space (where the pupil of the eye must be positioned for a full view). A long eye relief makes observing for long periods of time easy and tireless. Eyeglass wearers typically need an eye relief of 15mm.

Check our Where to Buy page for an authorized retailer near you. Most of our retail partners also have online stores for your convenience.  We recommend buying from only authorized retailers with direct accounts with our manufacturers.  Be aware there are resellers in the marketplace that may offer cheap prices online, but consider the additional costs like shipping, brokerage and warranty/repair service before making your purchase. Ideally, locate a shop near you where you can look through several different models and brands to find the optic right for you.

Learning Resources for Kids
S.T.E.M is a learning curriculum based on the idea of educating students in four specific disciplines:
  • Science
  • Technology
  • Engineering
  • Mathematics
STEM is important because it pervades every part of our lives. Science is everywhere in the world around us. Technology is continuously expanding into every aspect of our lives. By exposing students to STEM and giving them opportunities to explore STEM-related concepts, they will develop a passion for it and hopefully pursue a job in a STEM field. A curriculum that is STEM-based has real-life situations to help the student learn.¹
The Arctic tern Sterna paradisaea has the longest-distance migration of any bird, and sees more daylight than any other, moving from its Arctic breeding grounds to the Antarctic non-breeding areas. One Arctic tern, ringed (banded) as a chick on the Farne Islands off the British east coast, reached Melbourne, Australia in just three months from fledging, a sea journey of over 22,000 km (14,000 mi). Many tube nosed birds breed in the southern hemisphere and migrate north in the southern winter.¹
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The world’s smallest bird is called the Zunzuncito and is a species of hummingbird. It is native to Cuba and is also sometimes referred to as the Bee Hummingbird. The bee hummingbird is the smallest living bird but there are some extinct species that could be considered smaller. Females weigh 2.6 g and are 2.4 in long, and are slightly larger than males, which have an average weight of 1.95 g and length of 2.2 in. Like all hummingbirds, it is a swift, strong flier. ²