Definition

Noun: A reticle is a network of fine lines, dots, cross hairs, or wires located in the focal plane of the eyepiece of an optical instrument. It is used as a reference or aiming point for measurement or alignment.

Usage

The reticle is an essential component in optical devices, allowing the user to precisely target, measure, or align objects. It is found in instruments such as microscopes, telescopes, rifle scopes, and surveying equipment.

Examples

Advanced Usage

• Digital Reticle: In modern optics, such as in heads-up displays (HUDs) or digital camera viewfinders, the reticle can be a projected or electronic overlay rather than a physical etched glass.
• Illuminated Reticle: Many modern scopes feature an illuminated reticle, where the lines or dots are lit (often in red or green) to enhance visibility in low-light conditions.

Variants and Related Words

• Reticule (noun): An older or alternative term for reticle, with the same meaning.
• Graticule (noun): A term often used interchangeably with reticle, particularly in scientific and technical contexts (e.g., in cartography or microscopy).

Synonyms

• Crosshairs
• Graticule
• Aiming mark
• Reticule

Related Phrases

• Etched reticle: A reticle where the pattern is permanently engraved onto a glass plate.
• Wire reticle: A reticle constructed from fine strands of wire, common in older optical instruments.
• First Focal Plane (FFP) Reticle: A reticle placed in the front focal plane of a riflescope, meaning its apparent size changes as magnification is adjusted.
• Second Focal Plane (SFP) Reticle: A reticle placed in the rear focal plane of a riflescope, meaning its apparent size remains constant regardless of magnification.

Noun

1. a network of fine lines, dots, cross hairs, or wires in the focal plane of the eyepiece of an optical instrument