Best Monoculars For Birding - 35 to 42mm Lens Diameter

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.

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.

A monocular with an objective length diameter of 35mm to 42mm is very versatile, and you can get a good image. 42mm monoculars are the most popular on the market. For lighter and potentially cheaper models, check out the 35mm size.

A monocular with an objective length diameter of 35mm to 42mm is very versatile, and you can get a good image. 42mm monoculars are the most popular on the market. For lighter and potentially cheaper models, check out the 35mm size. Read More

Monoculars for birding require magnification of 10x for professionals and 8x for beginners. 10x is harder to stabilize by hand; hence, to keep the size smaller, choose an objective lens diameter of less than 50mm. A good 8x42 monocular weighs about 1.5 lbs. (0.7 kg), which is good for birding and on the heavy side for hiking.

Monoculars for birding require magnification of 10x for professionals and 8x for beginners. 10x is harder to stabilize by hand; hence, to keep the size smaller, choose an objective lens diameter of less than 50mm. A good 8x42 monocular weighs about 1.5 lbs. (0.7 kg), which is good for birding and on the heavy side for hiking. Read Less