Leupold BX-3 Alpine HD 10x42 Binoculars

SKU: 187990

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About this product

Leupold · BX-3 Alpine HD · Part 187990

Find movement faster. Hold detail longer.BX-3 Alpine HD 10×42 binoculars

From timber and river flats to open faces and coastlines, the 10×42 format balances useful reach with a wide, manageable view. Leupold’s Elite Optical System, HD lenses and 42 mm objectives deliver the clarity needed to scan confidently as daylight and terrain change.

Leupold BX-3 Alpine HD 10x42 binoculars viewed from the front-left with 42 mm objective lenses, centre focus wheel and tripod port visible — 10× magnification · 42 mm objectivesRoof-prism design · magnesium chassis

10×Magnification

42 mmObjective diameter

114 mField at 1,000 m

4.1 mmExit pupil

641 gApprox. weight

Official Leupold product film

The BX-3 Alpine HD in the field.

A concise look at the redesigned BX-3 Alpine HD family, its optical system, field construction and fit.

The all-round format

Why 10×42 is the everyday BX-3.

Ten power provides enough reach to inspect distant detail while remaining easier to steady and quicker to scan than higher magnifications. The 42 mm objectives keep the body compact and portable, with a stated 4.1 mm exit pupil for useful performance as outdoor light changes.

10×Reach with manageable shake

42 mmPortable entrance aperture

4.1 mmStated exit pupil

The lighter, wider-view option in the current BX-3 family.

Field width at 1,000 metresMore width helps locate movement

10×42114 m

12×5092.7 m

Approximate weightLess carried mass through the day

10×42641 g

12×50828 g

Body lengthA shorter profile in the harness

10×42145 mm

12×50163 mm

Compared with the BX-3 Alpine HD 12×50, the 10×42 is about 23% lighter, 18 mm shorter and shows about 23% more terrain width at the published 1,000 m reference distance. This is a size-and-field comparison, not an optical-quality ranking.

The practical advantage is steadiness. Ten power gives a meaningful increase in detail without magnifying hand movement as strongly as 12×. Most users can treat this as a hand-held binocular, then add a brace or tripod only when an observation becomes prolonged.

Elite Optical System

Clarity from first scan to final identification.

Leupold builds this generation of BX-3 around its Elite Optical System. The stated priorities are dawn-to-dusk light transmission, strong glare reduction, edge-to-edge clarity and the resolution needed to separate detail from terrain.

01 / LIGHT

Dawn-to-dusk viewing.

The system is designed to maintain a bright, useful image as available light changes—valuable when animals move at the margins of the day or cloud and shade flatten the scene.

02 / DETAIL

High-definition lenses.

Leupold specifies HD performance for clarity, colour and image resolution. At 10×, that resolving ability helps distinguish fine detail without giving up the wider, more forgiving field that makes this format so versatile.

03 / PROTECTION

Guard-ion coating.

The hydrophobic exterior lens coating helps shed water and dirt, making it easier to keep the viewing surfaces clear in damp grass, drizzle and dusty field conditions.

Official Leupold BX-3 Alpine HD feature graphic highlighting HD clarity, rugged armour, interchangeable eyecups and the built-in quarter-inch tripod port — Official Leupold BX-3 Alpine HD feature overview

6.5° angular field

114 metres of terrain at 1,000 metres.

The official specification is 342 ft at 1,000 yd. At the same angular scale, that equals 114 m at 1,000 m—a useful balance between broad situational awareness and the subject detail provided by 10× magnification.

A field number describes scene width, not image quality. In practice, the 10×42 view is broad enough for woodland edges, birds and moving wildlife while still providing useful reach across open country.

Handling and control

Built around the adjustments you actually use.

The redesigned magnesium chassis keeps the binocular rigid without unnecessary bulk. An improved armour texture adds grip, while the large central wheel and right-eye dioptre keep normal focusing familiar.

Rear view of the Leupold BX-3 Alpine HD 10x42 showing the centre focus wheel, right-eye dioptre and eyecup positions

Central focusA large tactile wheel is easy to locate and turn, including with gloves.

Right-eye dioptreBalances the two optical channels once to match differences between your eyes.

56–74 mm IPDHinge adjustment aligns both oculars with your pupils for one circular image.

Rubber armourThe enhanced texture provides a positive grasp in wet, cold or dusty conditions.

Interchangeable Form-Fit eyecups

Choose the contact point around your eyes.

Rather than one fixed eyecup shape, Leupold supplies three Form-Fit options. They screw on and off so you can prioritise stray-light control, everyday comfort or the lower position intended for use with glasses.

Winged

Helps block side light and creates a more enclosed viewing position.

Medium

The general-purpose option for comfortable everyday glassing.

Low / glasses

Designed to help eyeglass wearers access the stated 16 mm eye relief.

Hand-held freedom · supported precision

Comfortable hand-held. Ready for a tripod.

Ten power is a familiar hand-held balance for everyday glassing. When the observation becomes prolonged, a braced position or the built-in tripod interface can make small details easier to study without changing binoculars.

Hand-heldFastest for short scans. Use both hands, relax the shoulders and keep the focus wheel within easy reach.

BracedRest elbows on knees, a rail, vehicle frame or pack to reduce movement without assembling a tripod.

TripodBest for patient grid searches, judging fine detail or sharing a fixed view with another observer.

Optional support hardware sold separately

A rotating ¼-20 tripod port is already built in.

The integrated interface removes the need to improvise around the hinge. Attach compatible support hardware and rotate the binocular to the viewing angle you need. Leupold’s Quick-Stem Binocular Tripod Adapter (Part 182417) uses a universal stud and an Arca-Swiss compatible base with its own ¼-20 thread.

View the official Quick-Stem adapter information

One binocular for changing ground

From close bush to broad New Zealand country.

At approximately 641 g with a 114 m field at 1,000 m, the 10×42 is light enough to keep close and wide enough to respond when a subject appears unexpectedly—without giving up the reach needed across farms, valleys and coastlines.

Bowhunter holding Leupold BX-3 Alpine HD binoculars beside a bow in woodland

Magnesium chassis

A rigid internal structure designed to keep weight controlled while standing up to field use.

Waterproof + fogproof

Leupold uses proprietary internal gases and sealing methods to keep internal surfaces moisture-free through weather, elevation and temperature changes.

Extreme-climate tested

The binocular family is tested for substantial temperature changes; Leupold does not publish a model-specific IP rating or operating range for Part 187990.

Mixed-terrain hunting

The wide field helps find movement in timber and scrub, while 10× retains reach for slips, faces and clearings.

Birdwatching

A 1.9 m close focus and useful field width suit birds moving between nearby cover and more distant perches.

Coast, wetlands and farms

Suitable for seabirds, waterfowl, livestock and wildlife where the viewing distance changes constantly.

Travel and everyday observation

The shorter, lighter 42 mm body is easier to carry in a vehicle, pack or supplied wearable harness.

First-use setup

Set the fit once. Focus normally after that.

This model uses the right-eyepiece dioptre procedure in Leupold’s binocular manual. Make the calibration carefully and the centre wheel then handles normal near-to-far focusing for both eyes.

Choose eyecups and set eye spacing.Fit the Form-Fit eyecup style that suits you, then move the barrels through the 56–74 mm IPD range until both views merge into one clean circle.
Pick a detailed target about 90 metres away.Leupold’s manual specifies about 100 yards. A sign, textured tree or building edge provides a clear focusing reference.
Focus the left channel.Cover the right objective lens and turn the central focus wheel until the image seen by your left eye is crisp.
Balance the right channel.Cover the left objective, then turn the dioptre ring around the right eyepiece until the right-eye image is equally sharp.
Return to normal viewing.Uncover both objectives. Leave the dioptre at that personal setting and use only the central wheel to focus at different distances.

Supplied field kit

What is in the box.

The official package image shows the binocular with a wearable harness/carry case, protective and cleaning essentials, and the complete Form-Fit eyecup choice.

Leupold BX-3 Alpine HD 10x42 binoculars with wearable harness case, lens cloth, objective covers and interchangeable Form-Fit eyecups

BX-3 Alpine HD 10×42 binocular
Wearable binocular harness / carry case
Three Form-Fit eyecup styles in total
Pair of objective lens covers
Leupold lens cloth
Binocular documentation

Verified model data

Leupold BX-3 Alpine HD 10×42 specifications.

Metric conversions are shown for New Zealand use; original imperial figures published by Leupold are retained where relevant.

Identification
Product	Leupold BX-3 Alpine HD 10×42mm
Leupold part number	187990
Design	Roof-prism binocular
Optical
Magnification	10×
Objective lens diameter	42 mm
Linear field of view	342 ft at 1,000 yd (114 m at 1,000 m)
Angular field of view	6.5°
Eye relief	16 mm
Exit pupil	4.1 mm
Close focus	6.2 ft (approximately 1.9 m)
Interpupillary distance	56–74 mm
Optical system and protection
Leupold optical system	Elite Optical System
Lens performance	High-definition (HD)
Exterior lens protection	Guard-ion hydrophobic coating
Published optical priorities	Dawn-to-dusk light transmission, glare reduction, edge-to-edge clarity, resolution and colour
Mechanical and handling
Length	5.7 in (approximately 145 mm)
Weight	22.6 oz (approximately 641 g)
Chassis	Magnesium
Exterior	Easy-grip rubber armour with enhanced texture
Focus system	Large central focusing dial
Dioptre	Right-eyepiece adjustment
Eyecups	Interchangeable Form-Fit system; winged, medium and low/glasses options
Tripod interface	Built-in rotating ¼-20 port; tripod and optional adapter hardware sold separately
Environmental
Water protection	Waterproof
Internal fog protection	Fogproof; proprietary internal gas blend and seals
Environmental validation	Leupold extreme-climate exposure testing
Included
Carry system	Wearable binocular harness / carry case
Protection and care	Objective lens covers and lens cloth
Fit accessories	Three interchangeable Form-Fit eyecup styles in total
Documentation	Binocular instructions
Warranty and support
Manufacturer guarantee	Leupold Full Lifetime Guarantee for non-electronic binoculars, subject to current terms and exclusions
New Zealand distributor listed by Leupold	NIOA New Zealand

Lifetime product support

Built to perform—and backed for life.

Leupold’s current Full Lifetime Guarantee states that if a non-electronic binocular does not perform, it will be repaired or replaced free of charge, whether or not you are the original owner, with no warranty card, proof of ownership or time limit required.

International service should start with the local route.

Warranty exclusions apply for modification, misuse, accident, abuse or misapplication. Leupold asks international customers to make contact before sending an optic for service and lists NIOA New Zealand as its New Zealand distributor. Nothing in this product description is intended to limit any rights that apply under New Zealand consumer law.

Eye safety: Never look directly at the sun or another intense light source through binoculars. Serious and permanent eye damage can result.

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