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Photonics Dictionary

reticle

A reticle, also known as a reticule or graticule, is a pattern or set of markings placed in the focal plane of an optical instrument, such as a microscope, telescope, riflescope, or camera, to provide a reference point or aid in measurement or aiming.

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The design of a reticle can vary depending on its intended use. Common types of reticles include crosshairs (intersecting lines), dots, circles, or other geometric shapes. These markings can be etched onto glass, film, or other transparent materials, or they can be electronically generated in digital optical systems.

In microscopes and telescopes, reticles help researchers or observers to locate and measure objects of interest, determine distances, or make precise observations. In riflescopes and other sighting devices, reticles aid in aiming and targeting by providing a visual reference point for aligning the weapon with the target.

Reticles can also have additional features, such as adjustable illumination for low-light conditions or rangefinding markings to estimate distances.
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