ALPEN OPTICS · Binoculars · ED
ALPEN OPTICS Chisos 8×25 ED – Compact Binoculars | Roof Prism | BaK-4 | IPX7
8×25 magnification · ED glass · BaK-4 roof prism · PXA phase coating · UBX fully multi-coated · 110 m field of view at 1’000 m · 3.1 mm exit pupil · IPX7 waterproof · nitrogen purged · 268 g · polycarbonate housing · twist-up eye cups.
Pocket-sized precision – ED optics that fit in your hand
The ALPEN OPTICS Chisos 8×25 ED packs premium optical performance into a body you can slip into a jacket pocket. Extra-low dispersion (ED) glass elements virtually eliminate chromatic aberration, delivering sharp, colour-true images from edge to edge. BaK-4 roof prisms with PXA phase correction coating and UBX fully multi-coated optics push light transmission up to 95 %, producing bright, high-contrast views even in fading light. At just 268 g and measuring 106 × 101 × 47 mm, the Chisos 8×25 is the ideal companion for hikers, birders and travellers who refuse to compromise on image quality.
ED glass · PXA phase coating · IPX7
True-colour optics in a weather-sealed compact body – see more, carry less
Extra-low dispersion glass minimises chromatic aberration so colours remain vivid and edges stay crisp. The PXA phase correction coating on the BaK-4 roof prisms further enhances contrast and resolution, while UBX fully multi-coated lens surfaces push light transmission up to 95 %. An IPX7 waterproof rating combined with nitrogen purging guarantees fog-free, moisture-proof performance from −10 °C to +50 °C.
BaK-4 roof prisms with PXA phase coating – contrast you can see
Roof-prism binoculars are inherently more compact than Porro designs, but they can suffer from phase-shift artefacts that reduce contrast. The Chisos 8×25 solves this with a PXA phase correction coating applied directly to the BaK-4 prism surfaces, restoring full contrast and resolution. Combined with UBX fully multi-coated lens elements, the result is a bright, sharp image with faithful colour reproduction – exactly what you need when identifying birds in dense foliage or scanning a hillside at dusk.
IPX7 waterproof & nitrogen purged – built for the elements
The Chisos 8×25 is sealed to IPX7 standards, meaning it survives immersion in up to 1 m of water for 30 minutes. Internal nitrogen purging prevents fogging when moving between temperature extremes. The polycarbonate housing with rubber armouring absorbs shocks and provides a secure grip even in wet conditions. With an operating range of −10 °C to +50 °C, these binoculars are ready for anything from alpine snow to tropical humidity.
Key features – ALPEN OPTICS Chisos 8×25 ED
- 🔍 8×25 compact roof-prism binoculars – fits in a jacket pocket
- 💎 ED glass elements – virtually eliminates chromatic aberration
- ✨ PXA phase correction coating on BaK-4 prisms – enhanced contrast & resolution
- 🔦 UBX fully multi-coated optics – up to 95 % light transmission
- 🌍 110 m field of view at 1’000 m (8°) – wide panoramic view
- 💧 IPX7 waterproof + nitrogen purged – fog-free in all conditions
- ⚖️ Only 268 g – ultra-lightweight for all-day carry
- 👓 Twist-up eye cups – comfortable with or without glasses
- 🎯 5 m close focus – ideal for butterflies & flowers
- 🧳 Nylon carry case with shoulder strap included
Who is the ALPEN OPTICS Chisos 8×25 ED for?
The Chisos 8×25 ED is designed for outdoor enthusiasts who value portability without sacrificing optical quality: hunters glassing terrain from a ridgeline, birders who want a pocket binocular for spontaneous sightings, hikers keeping pack weight low, sports fans wanting a sharp view from the stands, and travellers who need a compact optic for sightseeing and wildlife encounters.
Technical Specifications – ALPEN OPTICS Chisos 8×25 ED
| Model | ALPEN OPTICS Chisos 8×25 ED (15185) |
|---|---|
| Product type | Compact binoculars |
| Manufacturer | Bresser GmbH, Rhede, Germany |
| Optical system | |
| Magnification | 8× |
| Objective diameter | 25 mm |
| Prism type | Roof (Dachkant) |
| Prism glass | BaK-4 |
| Lens glass | ED (extra-low dispersion) |
| Phase coating | PXA |
| Lens coating | UBX fully multi-coated (FMC) |
| Performance | |
| Field of view | 110 m at 1’000 m (8°) |
| Exit pupil | 3.1 mm |
| Close focus | 5 m |
| Interpupillary distance | 50–73 mm |
| Eye cups | Twist-up |
| Protection & durability | |
| Waterproof rating | IPX7 |
| Fog proof | Yes – nitrogen purged |
| Operating temperature | −10 °C to +50 °C |
| Construction | |
| Housing | Polycarbonate with rubber armouring |
| Colour | Green / black |
| Dimensions & weight | |
| Dimensions | 106 × 101 × 47 mm |
| Weight | 268 g |
| Warranty & origin | |
| Warranty | ALPEN OPTICS Deluxe – 5 years (extendable to 25) |
| Country of origin | China (designed in Germany) |
Box contents – ALPEN OPTICS Chisos 8×25 ED
- 🔍 ALPEN OPTICS Chisos 8×25 ED binoculars compact roof-prism binoculars with ED glass, BaK-4 prisms, PXA phase coating, UBX FMC
- 👜 Nylon carry case with shoulder strap for secure transport
- 🧹 Dust caps for objective and eyepiece lenses
- 📄 User manual
- 📋 Warranty card
Frequently Asked Questions – ALPEN OPTICS Chisos 8×25 ED
What is ED glass?
ED stands for extra-low dispersion. ED glass elements significantly reduce chromatic aberration (colour fringing), delivering sharper, more colour-accurate images compared to standard optical glass.
What is PXA phase coating?
PXA is a phase correction coating applied to the roof prism surfaces. It eliminates phase-shift artefacts inherent in roof-prism designs, resulting in higher contrast, better resolution and light transmission up to 95 %.
Is the Chisos 8×25 ED waterproof?
Yes. The Chisos 8×25 ED is rated IPX7, surviving immersion in up to 1 m of water for 30 minutes. Internal nitrogen purging prevents fogging from −10 °C to +50 °C.
Is this binocular suitable for glasses wearers?
Yes. The twist-up eye cups can be folded down to provide the correct eye relief for spectacle wearers, ensuring a full field of view without vignetting.
What case is included?
A nylon carry case with shoulder strap is included, along with dust caps for both objective and eyepiece lenses.
What warranty does the Chisos 8×25 ED have?
The Chisos 8×25 ED comes with the ALPEN OPTICS Deluxe warranty: 5 years standard, extendable to 25 years upon registration.
