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GOMU 13X50 Monocular Range Finder High Definition Waterproof Fogproof Carrying Case Porro Prism Wide Angle Spotting Scope Bird watching #02641018

GOMU 13X50 Monocular Range Finder High Definition Waterproof Fogproof Carrying Case Porro Prism Wide Angle Spotting Scope Bird watching
$ 39.99
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Selling Points

Compatibility: Bird watching
Type: Range Finder
Features: Waterproof Wide Angle
Eye Relief (mm): 18.5mm
Exit Pupil Diameter (mm): 4mm
Objective Lens (mm): 50
Field of View (m/m): 114m/1000m
Optical system: Porro
Waterproof Level: IPX-6
Tripod Mount: Yes


Compatibility Bird watching,
Type Range Finder, Dimlight, Zoom Binoculars,
Features Fogproof, High Definition, Waterproof, Spotting Scope, Wide Angle, Porro Prism, Carrying Case,
Structures Range Finder, Monocular,
Battery N/A,
Eye Relief (mm) 18.5mm,
Eye Relief Range (mm) 15-20mm,
Exit Pupil Diameter (mm) 4mm,
Exit Pupil Diameter Range (mm) 4-5mm,
Magnification 13,
Minimum Focus Distance (m) 4m,
Objective Lens (mm) 50,
Field of View (m/m) 114m/1000m,
Field of View Range 100-120ft/1000yds,
Field Range (°) 6.5°,
Eye Lens(mm) 22,
Lens Diameter(cm) 20-30MM,
Prism Type BAK4,
Optical system Porro,
Waterproof Level IPX-6,
Optical Coating Multi-coated,
Tripod Mount Yes,
Material Metal, Plastic,
Net Dimensions(cm) 19.0*9.0*6.5,
Net Weight(kg) 0.42,
Listing Date 01/20/2015,
Magnification Range
Magnification 10x to 14.9x,



  1. Q: What is night vision for the optical telescopes?
  • A:Night vision is the ability to see in low light conditions. Whether by biological or technological means, night vision is made possible by a combination of two approaches: sufficient spectral range, and sufficient intensity range.

    Night vision technologies can be broadly divided into three main categories: image intensification, active illumination and thermal imaging. The Optical telescopes use the principle of Image intensification to achieve the function of night vision.

    Image intensification magnifies the amount of received photons from various natural sources such as starlight or moonlight. Therefore, under low-light conditions, through the optical telescope we can only see the fuzzy image, except for the stars. We call it "Low Light Night Vision".

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