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Compact black porro prism binocular with rubber armour, central focus and twist-up eyecups

PENTAX

PENTAX UP 8-16x21 Black Porro Binocular

SKU CH-QKGF-8S79A

Compact reverse Porro prism binoculars with 8-16x zoom, fully multi-coated aspherical lenses, BaK4 prisms and synchronised IPD adjustment

  • TypeBinoculars
  • Adjustable zoom from 8x to 16x magnification
  • Fully multi-coated optics for better light transmission
  • Aspherical lens elements deliver corner-to-corner sharpness
  • BaK4 prism glass provides maximum resolution
  • Compact reverse porro design weighs 309g

Compact Variable-Power Porro Binocular

The Pentax UP 8-16x21 is a lightweight porro-prism binocular with a zoom range of 8× to 16× and 21 mm objective lenses. Its reverse porro design keeps the body narrow at 21 mm deep while the dual-axis hinge synchronises interpupillary adjustment. Fully multi-coated BaK4 prisms and aspherical lens elements maintain edge-to-edge sharpness across the zoom range.

Suits Walkers And Travelers Wanting One Glass

Hikers, birders and event-goers who need a single compact optic for both scanning landscapes and studying distant detail will appreciate the variable magnification and 309 g weight. Buyers who require a wider field of view at low power, larger exit pupils for dawn or dusk use, or waterproof and fog-proof construction should look at other models.

Zoom Range Of 8× To 16× With 21 mm Objectives

The 8× to 16× magnification span lets you switch instantly between broad overviews and detailed inspection without changing instruments. At the 16× setting the smaller exit pupil reduces image brightness compared with the 8× setting, so the highest power is best reserved for well-lit conditions.

Highlights

  • Adjustable zoom from 8x to 16x magnification
  • Fully multi-coated optics for better light transmission
  • Aspherical lens elements deliver corner-to-corner sharpness
  • BaK4 prism glass provides maximum resolution
  • Compact reverse porro design weighs 309g

Specifications

TypeBinoculars

Questions about this item

What are the dimensions and weight of the PENTAX UP 8-16x21 binoculars?

The binoculars measure 111mm in width, 21mm in depth, and 111mm in height, weighing 309g. The compact reverse porro prism design makes them easy to pack.

How do I adjust the interpupillary distance correctly on the dual axle system?

Hold both barrels and move them together or apart until you see a single, circular image. The synchronized dual axle adjusts both sides at once; a common error is adjusting only one side independently.

How should I clean the fully multi-coated lenses and BaK4 prisms without damaging the coatings?

Use a lens blower to remove dust first, then gently wipe with a microfibre cloth and optical cleaning fluid. Avoid dry wiping or using household cleaners, which can scratch the multi-coated surfaces.

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