Leupold binoculars: what each BX line buys, from BX-1 to BX-5
Our verdict for 2026: the BX number marks the line, not the magnification, and on Leupold's own pages it tracks the optical system: Advanced on the BX-1 and BX-2, Elite on the BX-3 and BX-4, Professional-Grade on the BX-5. Comparing a 10x42 from each line, start with the BX-3 Alpine HD 10x42 (around $300): Guard-Ion coating, a magnesium chassis, a 342 ft field, 16 mm of eye relief and a 6.2 ft close focus at 22.6 oz. If you wear glasses, the BX-4 Pro Guide HD Gen 2 (around $400) adds DiamondCoat 2, phase-coated prisms, a click-lock diopter and 17 mm of eye relief, the most of these 10x42s. The BX-5 Santiam HD (around $1,100) tops the lines compared here with a 341 ft field and a 5 ft close focus. Leupold's pages mark the BX-1 McKenzie HD (around $180) and BX-2 Alpine HD (around $250) as discontinued (October 2026). For ranging, look at the Range models; for a pocket pair, the BX-1 Rogue.
Specifications are Leupold's own. Prices verified October 14, 2026; confirm the current price on the retailer page.
Leupold sells its binoculars as numbered BX lines, and a line can come in more than one size (the BX-5 Santiam HD is also on our 8x42 page). To compare like with like, this page lines up a 10x42 from each line from BX-1 to BX-5 on Leupold's own published specifications, then gives each one a card with its price and its owner record on OpticsPlanet. The compact and rangefinding models get their own short sections below.
How we compared these: a research-based comparison built from Leupold's specification pages for each 10x42 (read in October 2026), the OpticsPlanet listings for price and owner reviews, and our existing coverage of the compact and rangefinding models. Where the retailer's specification differs from Leupold's, we print Leupold's figure. Scores are our editorial opinion, not a hands-on test of every model. See how we evaluate.
- The Leupold BX ladder in one table
- Leupold's 10x42 specifications side by side
- Leupold BX-1 McKenzie HD 10x42 - The entry rung
- Leupold BX-2 Alpine HD 10x42 - The wider-field rung
- Leupold BX-3 Alpine HD 10x42 - The default pick
- Leupold BX-4 Pro Guide HD Gen 2 10x42 - Best 10x42 for eyeglass wearers
- Leupold BX-5 Santiam HD 10x42 - The premium rung
- The compact line: BX-1 Rogue
- The rangefinding line: BX-4 Range and up
- Which Leupold binocular should you buy?
- FAQ
The Leupold BX ladder in one table
Each line is priced from the 10x42 we card for it. The optical system is the name Leupold prints on that model's page.
| Line | Optical system (Leupold) | What the step adds | Price |
|---|---|---|---|
| BX-1 McKenzie HD | Advanced | The entry rung: Abbe-Koenig prism, 22 oz, but a 304 ft field and 12 mm of eye relief. Marked discontinued by Leupold | around $180 |
| BX-2 Alpine HD | Advanced | A 342 ft field, 15 mm of eye relief and a tripod port. 13.5 ft close focus. Marked discontinued by Leupold | around $250 |
| BX-3 Alpine HD | Elite | Guard-Ion coating, magnesium chassis, Form-Fit eyecups, 16 mm of eye relief and a 6.2 ft close focus at 22.6 oz | around $300 |
| BX-4 Pro Guide HD Gen 2 | Elite | DiamondCoat 2, fully multi-coated lenses, phase-coated prisms, click-lock diopter, 17 mm of eye relief. 314 ft field, 25 oz | around $400 |
| BX-5 Santiam HD | Professional-Grade | The BX-4's coating list with a 341 ft field, a 5 ft close focus and 16.6 mm of eye relief at 24.3 oz | around $1,100 |
Leupold's 10x42 specifications side by side
Every value below is copied from Leupold's own product page for that model. Field of view is linear at 1000 yards, with Leupold's angular figure in brackets.
| Model | Field of view | Eye relief | Exit pupil | Close focus | Weight | Prism (Leupold's wording) | Coatings Leupold names |
|---|---|---|---|---|---|---|---|
| BX-1 McKenzie HD 10x42 | 304 ft (5.8 deg) | 12 mm | 4.2 mm | 9.8 ft | 22 oz | Abbe-Koenig | Not listed by Leupold |
| BX-2 Alpine HD 10x42 | 342 ft (6.5 deg) | 15 mm | 4.2 mm | 13.5 ft | 24.3 oz | Abbe-Koenig | Not listed by Leupold |
| BX-3 Alpine HD 10x42 | 342 ft (6.5 deg) | 16 mm | 4.1 mm | 6.2 ft | 22.6 oz | Not listed by Leupold | Guard-Ion |
| BX-4 Pro Guide HD Gen 2 10x42 | 314 ft (6 deg) | 17 mm | 4.2 mm | 9.3 ft | 25 oz | Open-bridge roof, phase coated | DiamondCoat 2, fully multi-coated, Guard-Ion |
| BX-5 Santiam HD 10x42 | 341 ft (6.5 deg) | 16.6 mm | 4.2 mm | 5 ft | 24.3 oz | Open-bridge roof, phase coated | DiamondCoat 2, fully multi-coated, Guard-Ion |
Read the table once and three things stand out. Eye relief rises with the line up to the BX-4 (12, 15, 16 and 17 mm) and dips slightly on the BX-5 (16.6 mm). Field of view does not rise with price: the BX-2 and BX-3 show 342 ft, the BX-5 341 ft and the BX-4 only 314 ft. And weight barely moves, from 22 to 25 oz, so moving up buys coatings (from the BX-3) and eye relief rather than a lighter pair. Close focus does not follow the line at all: 9.8, 13.5, 6.2, 9.3 and 5 ft from BX-1 to BX-5. The BX-3 exit pupil is Leupold's printed 4.1 mm; 42 divided by 10 gives 4.2 mm, the same as the others.
Where the retailer's numbers differ. The OpticsPlanet specification tables disagree with Leupold in places, and we print Leupold's figure each time: the BX-1's eye relief is listed there as 13.7 mm (Leupold: 12 mm), the BX-2's field as 367.5 ft and its weight as 28 oz (Leupold: 342 ft and 24.3 oz), and the BX-5's weight as 23.4 oz (Leupold: 24.3 oz). The retailer's BX-4 table mixes figures from several sizes of the line, so every BX-4 value here comes from Leupold's single 10x42 page.
The entry rung: Leupold BX-1 McKenzie HD 10x42
10x42 · Abbe-Koenig prism (Leupold) · Advanced Optical System · 12 mm eye relief · 22 oz
around $180exact price on OpticsPlanet
The BX-1 McKenzie HD is the cheapest full-size Leupold on this page, and its numbers explain why. Leupold lists its Advanced Optical System and an Abbe-Koenig prism, a 304 ft field of view at 1000 yds and 12 mm of eye relief: the narrowest field and the least eye relief of the 10x42s here. At 22 oz it is also the lightest of them, and Leupold packs a GO Afield shoulder strap, a binocular case, lens covers and a lens cloth. Weigh two things before you buy. Leupold's own page for this model marks it as discontinued (our read, October 2026). And its OpticsPlanet record is thin: two reviews, one 5-star that praises the brand in general and one 1-star from an owner who says they "fog up so easily even after trying to apply anti fog", where Leupold states that, like all Leupold binoculars, it is fogproof and waterproof. One report is not a pattern, but it is the only use report on the listing.
Pros
- At 22 oz, the lightest of the Leupold 10x42s on this page (Leupold)
- Abbe-Koenig prism per Leupold, the same prism wording Leupold uses for the BX-2 Alpine HD
- Field-replaceable twist-up eyecups, so a damaged eyecup can be swapped in the field
- GO Afield shoulder strap, case, lens covers and lens cloth in the box
Cons
- 12 mm of eye relief, the least of the 10x42s here, so eyeglass wearers may not see the full field
- The narrowest field of view on this page, 304 ft at 1000 yds against 342 ft on the BX-2 and BX-3 Alpine HD
- Leupold names no lens coating for it beyond its Advanced Optical System; Guard-Ion starts at the BX-3
- Leupold's own page marks it as discontinued (October 2026 read)
Best for: a light, inexpensive full-size pair for occasional use if you do not wear glasses. If you do, every rung above it gives you more eye relief.
Key specifications
| Magnification | 10x |
|---|---|
| Objective lens | 42 mm |
| Prism | Abbe-Koenig (Leupold's wording) |
| Optical system | Leupold Advanced Optical System; no lens coating named by Leupold |
| Eye relief | 12 mm |
| Exit pupil | 4.2 mm |
| Field of view | 304 ft at 1000 yds (5.8 degrees) |
| Close focus | 9.8 ft |
| Interpupillary distance | 56 to 74 mm |
| Weight | 22 oz |
| Length | 5.8 in |
| In the box | GO Afield shoulder strap, binocular case, lens covers, lens cloth (Leupold) |
| Leupold part number | 181173 |
| Leupold status | Marked discontinued on Leupold's page (read October 2026) |
The wider-field rung: Leupold BX-2 Alpine HD 10x42
10x42 · Abbe-Koenig prism (Leupold) · Advanced Optical System · 342 ft field · tripod port · 24.3 oz
around $250exact price on OpticsPlanet
The BX-2 Alpine HD keeps the BX-1's Advanced Optical System and Abbe-Koenig prism, per Leupold, and spends the difference on view and comfort. The field widens from 304 to 342 ft at 1000 yds, eye relief rises from 12 to 15 mm, and Leupold adds a rotatable 1/4-20 tripod adapter port. Its interpupillary range is the widest here, 57 to 78 mm, which matters if your eyes are set wide. What it gives up is close focus: at 13.5 ft it is the longest of the 10x42s on this page, so it is a pair for distance, not feeder birds, and at 24.3 oz it is 2.3 oz heavier than the BX-1. Of the 10x42s on this page it has the deepest owner record on OpticsPlanet, and the one complaint that repeats is the strap: two owners would rather have a neck strap than the GO Afield harness Leupold includes. Leupold's page marks this model discontinued too (October 2026).
Pros
- 342 ft field of view at 1000 yds, tied with the BX-3 Alpine HD for the widest here (Leupold)
- 15 mm of eye relief, 3 mm more than the BX-1
- A rotatable 1/4-20 tripod adapter port built in
- The widest interpupillary range on this page, 57 to 78 mm
Cons
- A 13.5 ft close focus, the longest of the 10x42s here, so it is poor for anything near
- Two owners on OpticsPlanet would rather have a neck strap than the included harness
- The same Advanced Optical System as the BX-1, with no lens coating named by Leupold
- Leupold's own page marks it as discontinued (October 2026 read)
Best for: distance glassing on a budget, from a tripod or the truck, and wide-set eyes. Step to the BX-3 if close focus or weight matter.
Key specifications
| Magnification | 10x |
|---|---|
| Objective lens | 42 mm |
| Prism | Abbe-Koenig (Leupold's wording) |
| Optical system | Leupold Advanced Optical System; no lens coating named by Leupold |
| Eye relief | 15 mm |
| Exit pupil | 4.2 mm |
| Field of view | 342 ft at 1000 yds (6.5 degrees) |
| Close focus | 13.5 ft |
| Interpupillary distance | 57 to 78 mm |
| Weight | 24.3 oz |
| Length | 5.5 in |
| Tripod | Rotatable 1/4-20 adapter port |
| In the box | GO Afield binocular harness, lens covers, lens cloth (Leupold) |
| Leupold part number | 181177 |
| Leupold status | Marked discontinued on Leupold's page (read October 2026) |
“At 300 yards in decent light any size antlers are easily identified.”
Stevepyucaipa (CA) via OpticsPlanet
The default pick: Leupold BX-3 Alpine HD 10x42
10x42 · Elite Optical System · Guard-Ion · magnesium chassis · 6.2 ft close focus · 22.6 oz
around $300exact price on OpticsPlanet
This is the Leupold most buyers should start with, and it is the first rung on what Leupold calls its Elite Optical System. Leupold lists Guard-Ion, a hydrophobic lens coating that sheds dirt and water, a fully redesigned magnesium chassis under rubber armor, and interchangeable Form-Fit eyecups in three sizes: winged, medium and low. Against the BX-2 it keeps the same 342 ft field and improves the numbers you feel in use: 16 mm of eye relief against 15, a 6.2 ft close focus against 13.5, and 22.6 oz against 24.3. Leupold's page for it carries no discontinued banner. Two caveats. Leupold's page names no prism type and lists nothing in the box, and it prints a 4.1 mm exit pupil where 42 divided by 10 gives 4.2 mm. And OpticsPlanet shows no owner reviews for it yet, so this pick rests on Leupold's published specification, not an owner record.
Pros
- The cheapest Elite Optical System 10x42 on this page, with Guard-Ion hydrophobic lens coating
- A 342 ft field, 16 mm of eye relief and a 6.2 ft close focus at 22.6 oz (Leupold)
- Magnesium chassis under rubber armor, and Form-Fit eyecups in three sizes
- A rotatable 1/4-20 tripod adapter port
Cons
- No owner reviews on OpticsPlanet yet, so there is no independent record of how it holds up
- No DiamondCoat 2 or phase-coated prisms, which Leupold lists only for the BX-4 and BX-5 here
- No locking diopter on Leupold's feature list; the click-lock diopter arrives at the BX-4
Best for: most hunters and hikers who want Leupold's better coatings, light weight and a short close focus. Step up to the BX-4 if you wear glasses and want a locking diopter.
Key specifications
| Magnification | 10x |
|---|---|
| Objective lens | 42 mm |
| Prism | Not listed by Leupold |
| Optical system | Leupold Elite Optical System; Guard-Ion lens coating |
| Eye relief | 16 mm |
| Exit pupil | 4.1 mm as Leupold prints it (42 divided by 10 is 4.2) |
| Field of view | 342 ft at 1000 yds (6.5 degrees) |
| Close focus | 6.2 ft |
| Interpupillary distance | 56 to 74 mm |
| Weight | 22.6 oz |
| Length | 5.7 in |
| Chassis | Magnesium, rubber armor coating (Leupold) |
| Eyecups | Interchangeable Form-Fit, three sizes (winged, medium, low) |
| Tripod | Rotatable 1/4-20 adapter port |
| In the box | Not listed on Leupold's page |
| Leupold part number | 187990 |
Best 10x42 for eyeglass wearers: Leupold BX-4 Pro Guide HD Gen 2 10x42
10x42 · open-bridge roof prism, phase coated · Elite Optical System · DiamondCoat 2 · click-lock diopter · 17 mm eye relief · 25 oz
around $400exact price on OpticsPlanet
The BX-4 Pro Guide HD Gen 2 is where Leupold adds the coating stack. On top of the Elite Optical System and Guard-Ion, Leupold lists DiamondCoat 2, an ion-assist coating on the exterior lenses, a fully multi-coated lens system and phase-coated, open-bridge roof prisms, plus a click-lock diopter adjustment, an over-sized eyepiece and the same three-size Form-Fit eyecups as the BX-3. Its 17 mm of eye relief is the most of the 10x42s on this page, which makes it the Leupold 10x42 to shortlist if you wear glasses. The trade is field and weight: 314 ft at 1000 yds against 342 on the BX-3, and 25 oz, the heaviest here. On OpticsPlanet two of its four reviews come from one reviewer name, and that owner lists the cons as well as the praise quoted below: the side slots for tethers are very small, the diopter wheel sits against the center focus wheel and is "a little hard to adjust", and the included neck strap is, in their words, "a piece of junk".
Pros
- DiamondCoat 2, fully multi-coated lenses, Guard-Ion and phase-coated roof prisms, the same coatings Leupold lists for the BX-5
- 17 mm of eye relief, the most of the 10x42s on this page
- A click-lock diopter adjustment, so the setting survives being carried and stowed
- Form-Fit eyecups in three sizes and a 1/4-20 tripod adapter
Cons
- A 314 ft field of view, narrower than the BX-2, BX-3 and BX-5
- At 25 oz the heaviest 10x42 here, 2.4 oz more than the BX-3
- A 9.3 ft close focus, well behind the BX-3 (6.2 ft) and BX-5 (5 ft)
- One owner found the tether slots too small and the diopter wheel, mounted against the focus wheel, a little hard to adjust
Best for: eyeglass wearers and long glassing sessions, and anyone who wants Leupold's top coatings for less than the BX-5. Stay on the BX-3 if weight and close focus matter more.
Key specifications
| Magnification | 10x |
|---|---|
| Objective lens | 42 mm |
| Prism | Open-bridge roof prism design, phase coated (Leupold) |
| Optical system | Leupold Elite Optical System; DiamondCoat 2, fully multi-coated, Guard-Ion |
| Eye relief | 17 mm |
| Exit pupil | 4.2 mm |
| Field of view | 314 ft at 1000 yds (6 degrees) |
| Close focus | 9.3 ft |
| Interpupillary distance | 56 to 74 mm |
| Weight | 25 oz |
| Length | 5.7 in |
| Diopter | Click-lock (range not stated by Leupold) |
| Eyecups | Interchangeable Form-Fit, three sizes; field replaceable |
| Tripod | 1/4-20 adapter |
| Leupold part number | 184761 |
“Not only do they have great clarity and brightness, but the ergonomics are fantastic.”
Chuck (MT) via OpticsPlanet
The premium rung: Leupold BX-5 Santiam HD 10x42
10x42 · open-bridge roof prism, phase coated · Professional-Grade Optical System · DiamondCoat 2 · 5 ft close focus · 24.3 oz
around $1,100exact price on OpticsPlanet
The BX-5 Santiam HD is the top of the non-rangefinding lines on this page, on what Leupold calls its Professional-Grade Optical System. It keeps the BX-4's coating list, DiamondCoat 2, fully multi-coated lenses, Guard-Ion and phase-coated open-bridge roof prisms, and wins back the field the BX-4 gave up: 341 ft at 1000 yds. It also focuses closest of the 10x42s here, at 5 ft, with 16.6 mm of eye relief at 24.3 oz, and Leupold packs a GO Afield shoulder strap, a binocular case, lens covers and a lens cloth. Check one number first: its interpupillary distance starts at 58 mm, the highest minimum on this page, so if your eyes are set close the barrels may not close far enough. On OpticsPlanet one owner who has used theirs for about a year calls it the clearest glass they have used and very good in low light, and the only complaint across its reviews is a case that fits a little tight.
Pros
- Leupold's Professional-Grade Optical System with DiamondCoat 2, fully multi-coated lenses, Guard-Ion and phase-coated prisms
- A 5 ft close focus, the shortest of the 10x42s here, with a 341 ft field
- 16.6 mm of eye relief, second only to the BX-4 on this page
- GO Afield shoulder strap, case, lens covers and cloth in the box
Cons
- By far the dearest rung, and the BX-4 shares its coating list for less
- Interpupillary distance starts at 58 mm, the highest minimum on this page
- At 24.3 oz it is 1.7 oz heavier than the BX-3
- Only three owner reviews on OpticsPlanet, so the owner record is thin
Best for: buyers who want Leupold's Professional-Grade Optical System, the top system named on the 10x42 pages we read, and a short close focus for near wildlife. Choose the BX-4 if the budget is the limit, or the 8x42 for low light.
Key specifications
| Magnification | 10x |
|---|---|
| Objective lens | 42 mm |
| Prism | Open-bridge roof prism design, phase coated (Leupold) |
| Optical system | Leupold Professional-Grade Optical System; DiamondCoat 2, fully multi-coated, Guard-Ion |
| Eye relief | 16.6 mm |
| Exit pupil | 4.2 mm |
| Field of view | 341 ft at 1000 yds (6.5 degrees) |
| Close focus | 5 ft |
| Interpupillary distance | 58 to 74 mm |
| Weight | 24.3 oz |
| Length | 5.9 in |
| Tripod | 1/4-20 adapter |
| In the box | GO Afield shoulder strap, binocular case, lens covers, lens cloth (Leupold) |
| Leupold part number | 174483 |
“I've had these now about a year. They Are the clearest glass I've used. Great in all conditions. They are very good in low light.”
William Raver (AZ) via OpticsPlanet
The compact line: BX-1 Rogue
Leupold's pocket binocular is the BX-1 Rogue, and it is a different design from the full-size BX-1 McKenzie HD above: a 25 mm inverted Porro prism compact rather than a 42 mm binocular. The Rogue 8x25 weighs 12.7 oz and the Rogue 10x25 12.6 oz, both give 15 mm of eye relief and both need 14.1 ft to focus, so they are travel and pack binoculars rather than birding ones. Both carry Leupold's Gold Ring lifetime guarantee. Our BX-1 Rogue 8x25 review covers the 8x25 in full, and our best compact binoculars guide compares both Rogues with the Zeiss and Vortex pocket models.
The rangefinding line: BX-4 Range and up
Leupold's rangefinding binoculars carry Range in the name. The one we cover is the BX-4 Range HD Gen 2 TBR/W 12x50: it ranges deer-sized game to 1,500 yards and reflective targets to 4,000 yards, and its TBR/W mode gives a ballistically corrected range plus a hold for a 10 mph crosswind out to 800 yards. The costs are physical: 37 oz, a 279 ft field and 14 mm of eye relief. It is compared with the Revic and GPO models in our best rangefinding binoculars guide. Above it, OpticsPlanet also lists a BX-6 Range HD 4DoF 10x42, which we have not reviewed.
Which Leupold binocular should you buy?
- Most buyers: the BX-3 Alpine HD 10x42. Elite Optical System with Guard-Ion, a 342 ft field, a 6.2 ft close focus and 22.6 oz, knowing it has no owner reviews yet.
- You wear glasses: the BX-4 Pro Guide HD Gen 2 10x42, for 17 mm of eye relief, DiamondCoat 2 and a click-lock diopter, or, in an 8x42, the Santiam HD 8x42 (18.5 mm) on our best 8x42 binoculars page.
- You want Leupold's top optical system in a 10x42: the BX-5 Santiam HD 10x42, with a 5 ft close focus. For dawn and dusk, see the Santiam HD 8x42 on our best 8x42 binoculars page.
- Tight budget, no glasses: the BX-1 McKenzie HD 10x42, the lightest here, or the BX-2 Alpine HD 10x42 for a wider field and a tripod port. Leupold marks both as discontinued; its current BX-2 10x42 is the BX-2 Timberline HD, which we have not carded.
- You want a pocket pair: the BX-1 Rogue 8x25.
- You want to range as well as glass: the BX-4 Range HD Gen 2 TBR/W 12x50 in our best rangefinding binoculars guide.
FAQ
What do the BX numbers mean on Leupold binoculars?
They mark the line, not the magnification. On Leupold's own pages the BX-1 McKenzie HD and BX-2 Alpine HD use its Advanced Optical System, the BX-3 Alpine HD and BX-4 Pro Guide HD Gen 2 its Elite Optical System, and the BX-5 Santiam HD its Professional-Grade Optical System. Of the 10x42 pages we read, only the BX-4 and BX-5 list DiamondCoat 2 and phase-coated prisms. Rangefinding models add Range to the name, such as the BX-4 Range.
Which Leupold 10x42 is best if I wear glasses?
Check eye relief first. Among the 10x42s on Leupold's pages, the BX-4 Pro Guide HD Gen 2 has the most at 17 mm, then the BX-5 Santiam HD at 16.6 mm, the BX-3 Alpine HD at 16 mm, the BX-2 Alpine HD at 15 mm and the BX-1 McKenzie HD at 12 mm. The BX-3 and BX-4 also come with Form-Fit eyecups in three sizes; Leupold names them winged, medium and low on the BX-3 page. Outside the 10x42s, the BX-5 Santiam HD 8x42 on our best 8x42 binoculars page lists 18.5 mm.
Are the Leupold BX-1 McKenzie HD and BX-2 Alpine HD discontinued?
Leupold says so. When we read its pages in October 2026, the 10x42 pages for both carried a banner saying the product has been discontinued. The BX-3 Alpine HD, BX-4 Pro Guide HD Gen 2 and BX-5 Santiam HD 10x42 pages did not. The specifications on this page are the ones Leupold still prints for both models. Leupold's current BX-2 10x42 is the BX-2 Timberline HD, whose page showed no discontinued banner in October 2026; we have not carded it.
Is the Leupold BX-4 Pro Guide HD Gen 2 worth it over the BX-3 Alpine HD?
If you wear glasses or want the better coatings, yes. On Leupold's pages the BX-4 adds DiamondCoat 2, fully multi-coated lenses, phase-coated roof prisms, a click-lock diopter and 1 mm more eye relief, 17 mm against 16. The BX-3 is lighter at 22.6 oz against 25, shows a wider field at 342 ft against 314 ft, and focuses closer, 6.2 ft against 9.3 ft.
Do Leupold binoculars have a lifetime warranty?
Leupold's own pages say so: the BX-1 McKenzie HD, BX-2 Alpine HD and BX-5 Santiam HD 10x42s are "guaranteed to perform for life", and the BX-3 Alpine HD is "guaranteed for life". Leupold's BX-2 Timberline HD 10x42 page puts it as a rule: like all Leupold binoculars, it is waterproof, fogproof and guaranteed to perform for life. The BX-4 Pro Guide HD Gen 2 page we read does not repeat the sentence in its description.
Which Leupold 10x42 focuses closest?
The BX-5 Santiam HD 10x42, at 5 ft on Leupold's page (the Santiam HD 8x42 on our 8x42 page lists the same 5 ft), followed by the BX-3 Alpine HD at 6.2 ft. The BX-4 Pro Guide HD Gen 2 needs 9.3 ft, the BX-1 McKenzie HD 9.8 ft and the BX-2 Alpine HD 13.5 ft. If you watch birds at a feeder or insects, close focus matters more than the line number.
Related: best binoculars · best 10x42 binoculars · best binoculars for hunting · Vortex binoculars, line by line · Nikon binoculars decoded.