Monocular
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A monocular is a compact refracting telescope used to magnify images of distant objects, typically using an optical prism to ensure an erect image, instead of using relay lenses like most telescopic s
Galilean type Soviet-made miniature 2.5 × 17.5 monocular
The highest specification 8× monocular from Opticron – 8×42 DBA
Two 8× monoculars showing eye lens diameter comparison
Asika 8×42 and Visionary 12×50 showing top-wheel focusing
Exit pupil
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In optics, the exit pupil of an optical system is the image of the system's aperture stop created by the optics that follow it in the system. Only rays which pass through the exit pupil can leave the
The image side of the lens of an SLR camera; the exit pupil is the light area in the middle of the lens.
The small exit pupil of a 25×30 telescope and large exit pupils of 9×63 binoculars suitable for use in low light
The exit pupil appears as a white disc on the eyepiece lens of these 8×30 binoculars. Its diameter is 30 ÷ 8 = 3.75 mm.