field glass

Thân thiện

A birdwatcher raises her field glass to observe a distant hawk.

Definition

Noun: A small, portable optical instrument, typically handheld, that uses lenses to magnify distant objects. It consists of two small telescopes mounted side-by-side, one for each eye, allowing for binocular vision.

Usage

The term "field glass" is used to refer to a compact, often low-magnification telescope designed for outdoor observation. It is a specific type of optical device. * The birdwatcher raised her field glass to get a better view of the eagle's nest. * He always carried a field glass in his pack during hikes to observe distant landmarks.

Advanced Usage

• "To train one's field glass on something": To point and focus the device on a specific object or area.
  • The naturalist trained his field glass on the herd of deer across the valley.

Variants and Related Words

• Binoculars (n): A more common modern synonym for a handheld, two-eyed magnifying optical instrument. While "field glass" can be synonymous with binoculars, historically it might also refer to a simple monocular (single-eye) spyglass.
• Spyglass (n): A small, single-tube telescope, often collapsible.
• Telescope (n): A broader term for any instrument designed to make distant objects appear nearer, which can be large and mounted or small and portable.

Synonyms

• Binoculars
• Spyglass (for a monocular type)
• Opera glasses (a specific type for theater use)

Related Phrases

• Field of view: The extent of the observable area seen through an optical instrument.
  • This field glass has a wide field of view, perfect for scanning the horizon.

Học thuật

Noun

1. a small refracting telescope

Từ đồng nghĩa

• glass
• spyglass