'Binoculars' Category Archives

Resolving Power

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One of the most important features or power of a telescope is its capability of showing us the smallest details along with clear, sharp images of the object that we are viewing. This is what’s referred to as its resolving power. There are certain celestial objects that are too close together that they tend to […]

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Eye Relief

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Photo by: Tamasflex Creative Commons The eye relief is an important concept in the use of equipments like a telescope, microscope, or binoculars. By definition, eye relief is the distance from the eye piece at which the eye can be placed to the entrance pupil of the eye. Instruments with short eye relief will require […]

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Focus

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Photo by: Ligar Creative Commons In physics, focus is defined as that point in which the rays of light converge or meet; or diverge in the case when light is refracted or reflected. In optics, it can mean a number of things including: ? A lens? focal point ? A lens? or a telescope?s eyepiece?s […]

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Exit Pupil

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Photo by: Tamasflex Creative Commons If you recently have had a conversation with an astronomer, then you’ve probably heard them mention the exit pupil as a certain eye piece in telescopes or binoculars. But what does exit pupil really mean, and how can it affect views when looking through a telescope?

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Field of View (FOV)

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In astronomy, field of view (FOV) is the amount of sky seen by the naked eye or through a telescope. This commonly refers to the angular area viewed by a telescope or any high magnification instrument; and is usually measured in square degrees, or for higher magnification instruments, in square arc-minutes. Separated from a telescope, […]

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Focal Length

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In astronomy, focal length is primarily used when referring to telescopes. It is the distance light travels starting from the lens of a telescope down to the point where it is focused. While in optics, focal length is simply defined as the strength by which an optical system (like a telescope) converges (focuses) or diverges […]

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Eyepiece

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An eyepiece, or ocular lens, is basically the lens through which one views in optical devices such as telescopes and microscopes. They are attached to such instruments, and used to magnify whatever object is pointed at.

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