Good binoculars are a lifetime purchase. Bad ones are an expensive mistake you carry every trip. Here is how to choose.
The Numbers: What 8x42 Actually Means
The first number is magnification — 8x means the image is 8 times larger than the naked eye sees. The second number is objective lens diameter in millimetres — 42mm is the lens that gathers light. Larger objective = more light = brighter image in low light.
For most hunting and birdwatching applications, 8x42 is the correct choice. It provides useful magnification without the hand tremor amplification of higher powers, and the 42mm objective gathers enough light for the dawn and dusk periods when game and birds are most active.
Glass Quality
The difference between a $150 binocular and a $600 one is primarily the quality of the glass and coatings. Cheap glass produces chromatic aberration (colour fringing at high-contrast edges), poor edge sharpness, and dim images. Once you look through quality glass, you cannot go back.
Look for: fully multi-coated optics, BAK4 prism glass (not BK7 — look at the eyepiece and check the prism is not cut off at the edges), and phase-corrected coatings for roof-prism designs.
Waterproofing
Any binocular used outdoors seriously should be O-ring sealed and nitrogen or argon purged — this prevents internal fogging when you move from cold to warm conditions. Check the specification, not just the marketing language.
Close Focus
For birdwatching, close focus distance matters — being able to focus on a bird 1.5 metres away opens a world of small passerine and wetland bird observation. This capability is equally valuable for [wildlife observation and monitoring](https://wildrangelife.com/blog/quolls-bilbies-native-mammals-conservation-australia) of native species. For hunting, close focus is less relevant — 3–5 metres is adequate.
Browse our outdoor optics and accessories range.
between cheap and premium glass is night and day — literally. Quality optics use multi-coated lenses that reduce glare, increase light transmission, and deliver sharp, colour-accurate images. Budget binoculars often suffer from chromatic aberration (colour fringing), poor edge clarity, and reduced brightness. Premium manufacturers like Swarovski, Zeiss, and Leica use extra-low dispersion (ED) glass and sophisticated coating systems. These binoculars cost $1,500-$4,000 but deliver exceptional performance. Mid-range options from Vortex, Bushnell, and Nikon ($300-$800) offer excellent value with solid warranties and respectable optical quality. For those starting out, the **Vortex Diamondback HD 8x42** represents outstanding value at around $230, whilst the **Bushnell Legend Ultra HD 8x42** at approximately $180 provides reliable performance for budget-conscious hunters. ## Field of View and Eye Relief Field of view (FOV) determines how much area you can observe at once. Measured in metres at 1,000 metres distance, a typical 8x42 binocular offers 120-140m FOV. Wider fields help track moving targets but may sacrifice edge sharpness. Eye relief — the distance your eyes can be from the eyepieces whilst maintaining full FOV — is crucial for glasses wearers. Minimum 15mm eye relief accommodates most prescription glasses, though 17-20mm is ideal. Many quality binoculars feature twist-up eyecups that adjust for glasses wearers. ## Waterproofing and Durability Australian conditions demand robust construction. Look for IPX7 waterproof rating minimum — this means submersible to 1 metre for 30 minutes. Nitrogen or argon gas purging prevents internal fogging when moving between temperature extremes. Rubber armouring provides grip and impact protection, essential when scrambling through scrub or climbing into tree stands. Quality hinges should operate smoothly with firm detents, and the focusing mechanism must remain precise after thousands of adjustments. ## Size and Weight Considerations Weight matters during long hunting trips or extended birdwatching sessions. Full-size 8x42 binoculars typically weigh 600-750 grams. Compact models like 8x32 or 8x25 reduce weight but sacrifice light-gathering ability. For stationary hunting applications like deer stands, weight is less critical than optical performance. However, hunters employing [spot and stalk hunting](https://wildrangelife.com/blog/spot-and-stalk-deer-hunting-australia-technique) techniques covering kilometres daily should consider the balance between performance and portability. ## Specific Hunting Applications ### Big Game Hunting Deer, pig, and cattle hunting requires binoculars that excel in dawn and dusk conditions. The larger 42mm objective lens becomes crucial here, gathering maximum available light. Quality optics prove essential when [spotting deer during the rut](https://wildrangelife.com/blog/fallow-deer-rut-act-hunting-account), as their behaviour patterns change significantly during this critical period. Consider models with: - Wide field of view for scanning open country - Excellent low-light performance - Robust construction for field conditions - Quality ranging reticles for distance estimation The **Leica Trinovid HD 8x42** at around $1,200 exemplifies premium hunting optics with exceptional low-light clarity. ### Waterfowl Hunting Duck and geese hunting presents unique challenges — water spray, condensation, and rapidly moving targets. Priority features include: - Superior waterproofing beyond basic IPX ratings - Fast, precise focusing for flying birds - Wide field of view for tracking flocks - Excellent colour definition to identify species ### Mountain Hunting High-altitude pursuits of goats, deer, or wild boar demand lightweight, compact optics that maintain performance. Temperature fluctuations and UV exposure test binocular construction. Essential features: - Lightweight construction without optical compromise - Fog-proof performance across temperature ranges - UV-resistant coatings - Secure grip surfaces for gloved hands ## Birdwatching Specialties ### Forest Birdwatching Dense bush and rainforest environments limit viewing distances but demand exceptional close-focus capability. Many birds remain within 5-15 metres, requiring binoculars that focus to 1.5-2 metres minimum. Brightness becomes crucial under forest canopies where available light drops dramatically. The difference between premium and budget glass shows most clearly in these conditions. ### Open Country Birding Plains, wetlands, and coastal environments allow longer observ