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Item#: N82E16884184001

PENTAX 8-16x21 UCF Zoom II Binoculars

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  • Black rubber housing
  • Inverted porro-prism desig
  • High-quality BaK4 prisms

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

Learn more about the PENTAX 8-16x21 UCF Zoom II


8-16x21 UCF Zoom II


Binocular Type: Porro prism, Linked-dual-axis, Center focusing, Center zoom ring, Center diopter adjustment knob

Lens Construction: Objective Lens: 2 elements in 1 group Eyepiece Lens: 4 elements in 3 groups

Coating: Lens: Multi-coating Prism: Coating

Magnification: 8 to 16X

Objective Lens Diameter: 21mm

Real Field of View: 5.0 degrees (8X) to 3.0 degrees (16X)

Apparent Field of View: 40 degrees (8X) to 48 degrees (16X)

Field Of View At 1000 Meters: 87m (8X) to 52m (16X)

Field of View at 1000 Yards: 261 ft. (8X) to 156 ft. (16X)

Exit Pupil: 2.6mm (8X) to 1.3mm (16X)

Eye Relief: 14mm (8X) to 11mm (16X)

Prism: Porro

Relative Brightness: 6.7 (8X) to 1.7 (16X)

Diopter Adjustment Range: +/- 4 m -1 (8X)

Diopter Adjustment: Center knob (pop up)

Eye Width Adjustment Range: 56 to 73.5mm

Focusing Range: 3m to infinity

Eyepiece Ring: Helicoid type

Body Color: Black

Height Width: 55mm x 111mm

Thickness: 111mm

Weight: 280g


Central fingertip control includes, focus, locking diopter and zoom control

Black rubber housing protects against dust and scratches

Revolutionary dual-axis, single body housing with synchronized eyepiece adjustment to assure correct optical alignment for comfortable viewing

Fast and easy adjusting center focusing for handling ease

Helicoid style eyepiece rings for quick adjustment of eye relief

Fully multi-coated optical eliminate harmful UV rays while improving light transmission and contrast with no flare or glare.

Inverted porro-prism design results in compact, light-weight body

High-quality BaK4 prisms for maximum light transmission and illumination
Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year
  • Read full details

Customer Reviews of the PENTAX 8-16x21 UCF Zoom II

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  • Phillip P.
  • 3/19/2013 1:05:12 PM
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsLeave it to Pentax!!

Pros: The image clarity of these binoculars is awesome! Some binoculars make you work to get into focus and once there you are liable to be out of focus after zooming. Not so the PENTAX 8-16x21 UCF Zoom II Binoculars. What you see through these lenses is a wonder to behold. definitely high quality glass and coatings. Light-gathering ability makes even dimly lit subjects view-able.

This instrument is light and small, which improves it's extended usage comfort factor, by a large margin.

The case back has 2 slots that allow secure belt attachment vs belt "clip on" types, which may easily be dislodged during climbing and other vigorous activities.

Diopter nob's "twist, to adjust & push in, to lock" system is a joy, especially if you are prone to loaning out your binoculars. Easy to remember your setting.

Diopter adjust, zoom, and focus are all in one column, making it needless to take your eyes away from the instrument to make any adjustment.

Eye relief can be left on and still fit in the case.

Underside tripod mounting plate is a welcome plus.

Cons: Should have made "cutouts" in the case's top edges (left and right), to allow the neck strap anchors to slide into the case more easily. A minor point to be sure.

An included neck relief pad should have been provided for the strap, rather than having rely on a 3rd party solution.

Other Thoughts: Birders will surely love the relatively low price. Good bang for the buck.

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Item#: N82E16884184001
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