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Best Monoculars For Backpacking and Hiking - 42 to 50mm Lens Diameter

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Updated: 11th May 2025

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The main consideration when selecting a monocular are the magnification level and objective lens diameter, which determine the optical capabilities of the monocular. The bigger the objective lens diameters, the better the image quality and the heavier the monocular may get. Waterproofing and night vision (thermal or infrared) are also important factors to consider when selecting a monocular.

Monoculars for backpacking and hiking should be small and portable. Consider choosing a maximum magnification of 10x and an objective lens diameter of not more than 42mm. 8x42 monocular weighs about 1.5 lbs. (0.7 kg) and 10x25 weighs about 0.75 lbs. (350 grams).

A monocular with an objective length diameter of 42mm to 50mm is the most versatile monocular on the market. The most popular are 42mm monoculars, which are great for hiking, birding, and wildlife viewing, while the 50mm size is advised for stargazing.

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Best Monoculars For Backpacking and Hiking - 42 to 50mm Lens Diameter

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