Description
National Geo 10X25 Compact Porro Prism Binocular
The National Geographic Compact Porro Prism Binoculars are an affordable, pocket-sized optic designed for casual outdoor enthusiasts, travelers, birdwatchers, and anyone who wants a lightweight pair of binoculars that can slip into a jacket pocket or daypack.
Key Specifications
Magnification: 8×
Objective lens diameter: 21 mm
Prism type: Porro BK-7
Field of view: 124 m @ 1000 m (7.1 )
Eye relief: ~11 mm
Close focus: approx. 3-5 m (varies slightly by unit)
Coatings: Fully coated optics (blue-green coating)
Body: Rubber-armored aluminum/plastic with fold-down rubber eyecups
Dimensions (folded): ~10.5 × 9 × 4 cm
Weight: 190-200 g
Included accessories: Soft carrying pouch, neck strap, cleaning cloth
The UG4008 delivers surprisingly decent optical performance for its class:
Bright, reasonably sharp center field during daylight hours
Acceptable color reproduction with only mild chromatic aberration on high-contrast edges
Good contrast for birding, hiking, or sightseeing in good light
Porro design gives a slightly more three-dimensional image than equivalently priced roof-prism models
Limitations (to be expected at this price point):
Noticeable edge softness and distortion toward the outer 20-25% of the view
Performance drops quickly in low light (twilight, dense forest shade) due to the small 21 mm objectives and BK-7 prisms
Some light flare when looking toward bright light sources
Eyepiece design and short eye relief make it less ideal for eyeglass wearers
Build Quality & Ergonomics
The binoculars feel solid for the money. The rubber armoring provides decent grip and minor drop protection. The central focus wheel is smooth, and the fold-down eyecups work well for non-eyeglass users. At under 200 grams and truly pocketable when folded, they're one of the few binoculars you'll actually carry "just in case."
Perfect for:
Casual hikers and travelers who want something smaller than phone-sized
Kids or beginners getting their first pair of binoculars
Concert or sports events (when you can't bring larger optics)
Backup/glovebox/emergency-kit binoculars
Not ideal for:
Serious birding or low-light wildlife observation
Astronomy (virtually no light-gathering power)
Users who wear eyeglasses and need long eye relief
The National Geographic UG4008 punches well above its weight in the ultra-compact category. It offers legitimate 8× magnification in a package smaller and lighter than most smartphones-for pocket change. If you need genuine binoculars that disappear into a pocket until the moment you spot a whale, hawk, or stadium scoreboard, these little yellow-and-black classics remain one of the best budget choices available.
Highly recommended as an impulse buy or gift for anyone who loves the outdoors but hates carrying extra gear.
Water-resistant and rubber coated
Porro-Prism
Magnification: 10x Lens Diameter: 25mm
Lightweight, compact and comfortable
Made of fully-coated BK 7 glass
25mm aperture that is perfect for daytime observation
Comes with a case, strap and cleaning cloth.
What's in the box
1 x Binocular
1 x Carry case