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2. Reticle - Wikipedia

   en.wikipedia.org/wiki/Reticle

   A reticle, or reticule [1] [2] also known as a graticule, is a pattern of fine lines or markings built into the eyepiece of an optical device such as a telescopic sight, spotting scope, theodolite, optical microscope or the screen of an oscilloscope, to provide measurement references during visual inspections.

3. Telescopic sight - Wikipedia

   en.wikipedia.org/wiki/Telescopic_sight

   A reticle that is too bright will cause glare in the operator's eye, interfering with their ability to see in low-light conditions. This is because the pupil of the human eye closes quickly upon receiving any source of light. Most illuminated reticles provide adjustable brightness settings to adjust the reticle precisely to the ambient light.

4. Advanced Combat Optical Gunsight - Wikipedia

   en.wikipedia.org/wiki/Advanced_Combat_Optical...

   The technique is essentially using the illuminated part of the reticle and its focusing rear eyepiece as a collimator sight. [15] As in any other collimator sight, the user does not actually look through the sight but instead keeps the collimated (infinity) image of the illuminated part of the reticle in focus with the dominant eye while the ...

5. Eyepiece - Wikipedia

   en.wikipedia.org/wiki/Eyepiece

   Many of these eyepieces that come with such telescopes are plastic, and some even have plastic lenses. High-end telescope eyepieces with this barrel size are no longer manufactured, but you can still purchase Kellner types. 1.25 inch (31.75 mm) – This is the most popular telescope eyepiece barrel diameter. The practical upper limit on focal ...

6. SUSAT - Wikipedia

   en.wikipedia.org/wiki/SUSAT

   SUSAT is constructed from a one-piece, pressure die-cast, aluminium body, into which the eyepiece, objective lens and prisms are fitted as assemblies. The SUSAT sight was developed in the United Kingdom by Royal Armament Research Development Establishment (RARDE) and is manufactured by United Scientific Instruments and Avimo, now known as ...

7. PSO-1 - Wikipedia

   en.wikipedia.org/wiki/PSO-1

   The metal body of the PSO-1 is made from a magnesium alloy. The PSO-1 features a battery-powered red illuminated reticle with light provided by a simple diode bulb. It features professionally ground, fully multi-coated optical elements, a baked enamel finish for scratch protection, and an attached, quick-deployable, extendable sunshade.