Leica

Leica 40391 Monovid 8x20 Monocular Red

4.1 (10 reviews)

Premium Leica 8x20 pocket monocular with waterproof construction and close-up lens for detailed macro observation.

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Overview

The Leica Monovid 8x20 is a premium pocket monocular engineered for those who refuse to compromise on optical quality even in the smallest form factor. Weighing a mere 4 ounces, it slips into a jacket pocket or clips onto a belt yet delivers the crisp, high-contrast imagery Leica is renowned for. The 8x magnification strikes an ideal balance between reach and stability for handheld use, while the 20mm objective lens keeps the body slim enough for true everyday carry. Nitrogen filling ensures the internal optics remain fog-free in temperature swings and humid environments, and waterproofing to 16.5 feet means rain, splashes, or even brief submersion won't damage the unit.

A standout feature is the included close-up lens that threads onto the eyepiece, transforming the Monovid into a macro viewer capable of focusing from just 10 to 12 inches away. This makes it a versatile tool for birders who also want to examine plant details, collectors inspecting fine art or stamps, or anyone who appreciates a closer look at the world. The 15mm eye relief ensures comfortable viewing for eyeglass wearers, and the included leather case keeps the monocular protected when not in use. With a close focusing distance of 1.8 meters in standard mode and a twilight factor of 12.7, the Monovid performs best in daylight conditions where its optical precision truly shines.

Key Features

Handy, versatile , and only 4 ounces.

Nitrogen filled for waterproofing and non-fogging.

Waterproof to 16 feet.

Specifications

Magnification
8x
Objective Lens Diameter
20 mm
Exit Pupil
2.5 mm
Twilight Factor
12.7
Eye Relief
15 mm
Objective Angle of View
6.3°
Close Focusing Distance
1.8 m (10–12 in with close-up lens)
Watertightness
To a depth of 5 m / 16.5 ft
Nitrogen Filled
Yes
Eyepiece
Suitable for eyeglass wearers
Weight
4 ounces
Color
Red
Included Accessories
Leather Case, Close-up Lens

Pros & Cons

👍 Pros

  • Exceptional Leica optics deliver sharp, high-contrast 8x magnification in a pocket-sized body
  • At only 4 ounces it is extremely lightweight and easy to carry all day
  • Nitrogen-filled and waterproof to 16.5 feet so it handles rain and humidity without fogging
  • Included close-up lens enables macro viewing from as near as 10 inches
  • 15mm eye relief accommodates comfortable use with or without eyeglasses

👎 Cons

  • Premium Leica pricing places it well above most consumer monoculars
  • 8x20 configuration provides a relatively narrow 6.3-degree field of view
  • Single 20mm objective lens limits light gathering in low-light conditions compared to larger optics
  • Monocular design lacks the depth perception of binoculars for extended observation

Frequently Asked Questions

Yes, it includes a close-up lens attachment that allows focusing as near as 10–12 inches, making it excellent for inspecting insects, flowers, and fine details.
Yes, it is nitrogen-filled and waterproof to a depth of 16.5 feet (5 meters), which also prevents internal fogging in humid conditions.
Yes, the eyepiece is designed to accommodate eyeglass wearers, with 15mm of eye relief for comfortable viewing with or without glasses.
It weighs just 4 ounces, making it one of the lightest quality monoculars available for pocket carry.
Yes, a leather case is included for safe storage and transport.