VIVI Focus 10-30×50 Versatile Zoom Binoculars
The VIVI Focus 10-30x50 binoculars are the only zoom model in the VIVI Focus series, offering continuous 10x-30x variable magnification in one versatile instrument. Start at 10x to take in the whole scene, then zoom up to 30x to study a distant subject — no changing equipment, no missing the moment.
Product Description
The VIVI Focus 10-30×50 binoculars are the only zoom model in the VIVI Focus series, offering continuous 10x-30x variable magnification in one versatile instrument. Start at 10x to take in the whole scene, then zoom up to 30x to study a distant subject — no changing equipment, no missing the moment.
One Instrument, Every Distance
The continuous 10x-30x zoom lets you adjust magnification after focusing, moving smoothly from broad scenery to fine detail. As magnification rises, the field angle naturally narrows from 3.5° to 1.4° — a gentle reminder to zoom deliberately.
Porro-Prism Optics with Real Depth
The Porro prism design with a fully multi-coated BAK4 prism and FMC multi-layer coating on the eyepiece and objective lenses supports bright, natural images with a satisfying sense of depth.
Compact and Travel-Ready
At 900g in an ergonomic aluminum alloy body with vertical anti-slip stripes and a glove-friendly center focus wheel, the VIVI Focus 10-30×50 is a practical companion for travel, events and field observation alike.
Why Choose the VIVI Focus 10-30×50?
The VIVI Focus 10-30×50 answers a simple question: why carry two binoculars when one can do both jobs? Fixed-power models like the VIVI Focus 10×50 binoculars lock you into one magnification; the 10-30×50 zoom lets you start wide at 10x for finding your subject, then climb to 30x for detail that no fixed 10x or 12x model can match.
Compared with the VIVI Focus 16×50 binoculars, the zoom model is more flexible rather than simply more powerful: 16x is fixed and tripod-dependent, while the 10-30×50 ranges from comfortable handheld 10x viewing up to 30x reach on demand.
Keep in mind the honest physics of zoom optics: as magnification increases, the field of view narrows (3.5° down to 1.4°), the exit pupil shrinks (5.2mm down to 1.67mm) and the image dims, so the brightest, widest views are always at the low end. Used with that understanding, this is one of the most versatile observation tools in the lineup.
Product Features
- 10x-30x Continuous Zoom: Adjustable magnification supports flexible viewing from wide scenes to distant detail.
- 50mm Large Objective: The 50mm objective provides generous light intake for outdoor observation across the zoom range.
- Porro Prism Design: The Porro prism layout delivers a natural sense of depth and dimension in the image.
- BAK4 Prism Optics: A fully multi-coated BAK4 prism supports stable, clear imaging.
- FMC Multi-Layer Coating: Fully multi-layer coating on eyepiece and objective lenses supports brightness and color fidelity.
- 2 Elements in 1 Group Objective: A simple, well-corrected objective configuration that supports a clean image.
- Spherical Lens Design: All-glass spherical optics support consistent image quality.
- Wide Variable Field: The field angle spans 3.5° to 1.4°, giving you maximum coverage at 10x and tight detail framing at 30x.
- 5.2-1.67mm Exit Pupil Range: A bright, easy view at 10x that tightens progressively as you zoom.
- 22-16.5mm Eye Relief Range: Comfortable viewing distance maintained across the zoom range.
- Large Center Focus Wheel: Central focus control supports quick, precise adjustment after zooming.
- Glove-Friendly Focusing: The oversized wheel can be operated accurately with gloves on.
- Aluminum Alloy Body: Durable housing with rubber armor for field reliability.
- Vertical Anti-Slip Grip: Grip stripes improve handling security in active use.
- Compact 900g Build: A travel-friendly weight for a large-aperture zoom instrument.
Application Areas
Outdoor Tourism
Zoom from a full valley panorama at 10x to a distant village spire at 30x — one instrument covers every stop on the itinerary.
Outdoor Adventures & Nature Exploration
The flexible zoom handles both close woodland scenes and far ridgeline checkups, while the 900g body stays comfortable on the trail.
Sports Events
Follow the play at 10x when action moves fast, then push to 30x to read faces and numbers during replays and stoppages.
Concerts & Large Venues
Frame the entire stage at low power, then zoom in on a soloist for detail — ideal for large arenas and outdoor festivals.
Power Safety Inspections
Inspectors can survey a substation broadly, then zoom toward 30x to examine specific insulators and hardware from the fence line.
Forestry Surveys
Scan a treeline at 10x to locate points of interest, then increase magnification to assess individual crowns and deadwood.
Security & Patrol Inspection
Adjustable magnification supports both wide situational awareness and focused identification of distant individuals or vehicles.
Industrial Inspections
The zoom range combined with center focusing assists visual inspection of equipment, rooftops and structures at varying distances.
Archaeological Research & Field Surveys
Observe an entire site at low power, then zoom into specific structures, trench profiles or terrain features without moving.
Railway Line Selection & Land Surveys
Zoom capability supports route assessment and terrain verification across long sightlines during survey fieldwork.
Technical Parameters
| Specifications | Technical Parameter |
|---|---|
| Product Model | Focus 10-30×50 |
| Magnification | 10x-30x |
| Objective Diameter | 50mm |
| Eyepiece Diameter | 20mm |
| Prism Material | BAK4 |
| Prism Type | Porro prism |
| Coating | FMC multi-layer coating |
| Focusing System | Center focus |
| Focusing Lens | Eyepiece focusing |
| Objective Configuration | 2 elements in 1 group |
| Lens Type | Spherical lens |
| Optical Material | All optical glass |
| Exit Pupil Diameter | 5.2-1.67mm |
| Eye Relief | 22-16.5mm |
| Field Angle | 3.5°-1.4° |
| Interpupillary Distance | 58-73mm |
| Housing | Aluminum alloy |
| Rubber Material | NBR + PVC rubber |
| Product Size | 195 × 205 × 65mm |
| Product Weight | 900g |
FAQ
What magnification range does the VIVI Focus 10-30×50 offer?
The binoculars provide continuous 10x-30x zoom, so you can start at 10x for a wide, bright view and increase magnification up to 30x for distant detail — all in one instrument.
What happens to the field of view at high magnification?
As with all zoom optics, the field narrows as magnification rises: from 3.5° at 10x down to 1.4° at 30x, while the exit pupil shrinks from 5.2mm to 1.67mm and the image dims. For the brightest, widest views, stay near the low end; use high power deliberately for distant subjects.
Are VIVI Focus 10-30×50 binoculars waterproof?
The published specification for this model does not include a waterproof rating. Please confirm the protection level with the manufacturer before using the binoculars in wet conditions.
What is the field of view of the VIVI Focus 10-30×50?
The field angle ranges from 3.5° at 10x to 1.4° at 30x, depending on the selected magnification.
Can the focus wheel be used while wearing gloves?
Yes. The large center-axis focus wheel is specifically designed for accurate focusing even with gloves on in cold or demanding conditions.
How much do VIVI Focus 10-30×50 binoculars weigh?
They weigh approximately 900g — a compact, travel-friendly weight for a large-aperture zoom binocular.
What is the difference between the VIVI Focus 10-30×50 and the VIVI Focus 10×50?
The VIVI Focus 10-30×50 binoculars offer variable zoom from 10x to 30x for multi-distance versatility, while the VIVI Focus 10×50 binoculars provide a fixed, easy-to-use 10x image with a wide, steady field. Choose zoom for flexibility, fixed power for simplicity.
What are zoom binoculars good for?
Zoom binoculars suit situations where viewing distances change constantly — travel, sports, concerts, inspections and surveys — letting one instrument cover the work of several fixed-power models.
