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8-16x21 UCF Zoom II Binoculars


Item Number: PTX 62217

Product Information:

  • 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
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


Lens: Multi-coating Prism: Coating


8 to 16X

Objective Lens Diameter:


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)



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:


Height Width:

55mm x 111mm








Eyepiece lens caps, Case, Neck strap


With a magnification range from 8X to 16X, the 8-16X21 UCF Zoom II binocular gives you incredible zooming ability with the convenience of a compact design. As with other UCF models, the 8-16x21 UCF Zoom II has an innovative dual-axis eye-distance adjustment system, high-refraction BaK4 glass prisms, multi-coated optical elements, and aspherical lens elements incorporated into the eyepiece optics. This portable, compact, user-friendly binocular is perfect for the viewer on the go - whether it be bird watching, sporting events, wildlife or indoor performance viewing.

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