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Silver cylindrical zoom monocular with textured grip and rotating eyecup

15-45x55 Zoom Monocular 55mm BAK4 Prism 5.6° FOV

SKU CH-VY0A-590TK

Variable 15-45x zoom with a 55 mm objective and BAK-4 prism delivers a 5.6° field of view in a waterproof, compact body

  • Part type or number15-45 × 55
  • Field of view5.6 degrees
  • Objective lens55
  • Overall magnification45
  • Details1x Monocular, 55, 15-45x, 45, 5.6 degrees, Manual Focus, Str
  • Key features15-45x Zoom, BAK-4 Prism, Compact, Waterproof, Non-slip Grip
  • Adjustable 15-45x zoom covers wide scenes and fine detail
  • 55 mm objective lens gathers ample light for bright views
  • BAK-4 prism delivers sharp, colour-true images edge to edge
  • 6° field of view spans 294 ft at 1,000 yd
  • Waterproof, non-slip body weighs 1.08 lb for easy carry

15-45x Zoom Monocular

The 15-45x55 zoom monocular provides variable magnification from 15x to 45x through a 55 mm objective lens. It uses a BAK-4 prism for high light transmission and edge-to-edge sharpness. The compact, waterproof body includes a non-slip grip and a twist-up eyecup for use with or without glasses. It suits adults who want a single optic for bird watching, travel, concerts and outdoor sports.

5.6° Field of View and Fixed Optics

The 5.6 degree field of view delivers a wide scene of 294 feet at 1000 yards, which is set by the optical design and cannot be changed. There is no night-vision capability, so low-light performance depends entirely on the 55 mm aperture and prism quality. Manual focus and a straight-through body mean the user must adjust the eyepiece for each distance, and the zoom range is limited to the stated 15-45x.

55 mm Objective Lens Decides Light Grasp

The 55 mm objective diameter is the single specification that determines how much light the monocular gathers and therefore how bright the image appears at high magnification. Buyers who need a brighter exit pupil for dawn or dusk observation, or who require a wider maximum field than 5.6 degrees, should look for a larger objective. This model is not for users who need built-in image stabilisation or electronic night vision.

How it compares

Measured against everything we stock in Binoculars, Scopes & Sights, at today’s prices. Recalculated every night.

Price $43.99
Cheaper than about 69% of the 1,401 comparable items (median $93.99).

Specifications

Product
Part number15-45 × 55
Part type or number15-45 × 55
Audio & video
Night vision supportNo
Field of view5.6 degrees
Size & build
Size or dimensions8.27 in × 3.35 in × 2.76 in
More details
Objective lens55
Overall magnification45

Questions about this item

Which magnification range should I choose for bird watching?

The monocular zooms continuously from 15x to 45x, so you can scan wide at low power and zoom in for detail without swapping optics.

What does the 5.6° field of view give me at distance?

At 1000 yards the view spans 294 feet, letting you follow moving subjects like birds or athletes without losing them at the edges.

How does the BAK-4 prism affect image quality in practice?

The BAK-4 prism transmits more light to the eye than standard prisms, producing brighter, sharper images with less colour fringing, especially in low light.

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