A good binocular is the piece of hunting gear you will use most. You glass from the truck, from the stand and on every ridge you climb. The spec sheet can look confusing, but only a handful of numbers really decide how a binocular performs. This guide walks through them in plain language.
What “8×42” really means
The first number is magnification: an 8x binocular makes an animal look eight times closer. The second number is the diameter of each front (objective) lens in millimeters. Bigger lenses gather more light, but they also add size and weight.
8x or 10x?
- 8x gives a wider, steadier view that is easier to hold still. It is a great all-round choice for timber, thick cover and moving game.
- 10x shows more detail at distance, which helps in open country, mountains and fields. The trade-off is a narrower field of view and more visible hand shake.
- Above 12x, most hunters need a tripod to get the full benefit.
Low-light performance and exit pupil
Divide the objective size by the magnification to get the exit pupil: 42 ÷ 8 = 5.25 mm. A larger exit pupil delivers a brighter image at dawn and dusk, exactly when game moves. For early-morning and last-light hunting, aim for 4 mm or more.
Glass and coatings
Look for “fully multi-coated” lenses, which reduce reflections and boost brightness. Extra-low dispersion (ED or HD) glass cuts color fringing so antlers and edges stay sharp. In roof-prism models, phase-corrected prisms make a visible difference in contrast.
Comfort and durability
- Eye relief: if you wear glasses, choose 15 mm or more and twist-up eyecups.
- Waterproof and fogproof: O-ring sealing plus nitrogen or argon purging keeps moisture out in rain and cold mornings.
- Weight: full-size 42 mm binoculars typically weigh 20–30 oz. A chest harness spreads the load and keeps them ready.
- Warranty: many respected optics brands offer lifetime or unconditional warranties — it is worth checking before you buy.
Quick checklist
- Thick cover or general use: 8×42.
- Open country or long-range glassing: 10×42 or 10×50.
- Backcountry where every ounce counts: 8×32 or 10×32.
Browse our Hunting & Shooting category to compare binoculars, rangefinders and accessories from brands we carry.
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