range finder
Definition
Noun: A device or instrument used to determine the distance from the observer to a target object. It operates by using acoustic, optical, or electronic methods to measure this distance accurately.
Usage
A range finder is used to measure distance precisely. It is commonly employed in photography, surveying, golf, hunting, and military applications. - The photographer used a laser range finder to focus on the distant mountain. - Golfers often carry a small range finder to calculate the distance to the flag.
Advanced Usage
- Electronic Range Finder: A modern device that uses lasers or radio waves to calculate distance by measuring the time it takes for a signal to reflect off the target.
- The surveyor relied on an electronic range finder for the land measurement.
- Optical Range Finder: A device, often using a coincidence or stereoscopic principle, where the user aligns two images to determine range.
- Vintage cameras sometimes have a built-in optical range finder for focusing.
Variants and Related Words
- Rangefinding (noun/adjective): The act or process of determining range.
- Rangefinding technology has advanced significantly.
- Laser rangefinder (compound noun): A specific type of electronic range finder that uses a laser beam.
- The military uses advanced laser rangefinders for targeting.
Synonyms
- Telemeter: An instrument for measuring distance.
- Distance meter: A device that measures distance.
Related Phrases
- To take a range reading: To use a range finder to obtain a distance measurement.
- The hunter took a range reading before taking the shot.
Noun
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a measuring instrument (acoustic or optical or electronic) for finding the distance of an object
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