Pentax 8.5×21 U-Series Papilio II Binoculars


Key Features:
  • Aspherical Lens Elements
  • BAK4 Porro Prisms
  • Fully Multi-Coated Optics
  • Angle of View: 6°
  • Minimum Focus of 20″
  • Center Focusing
  • Twist-Up Eyecups
  • 1/4″-20 Tripod Socket

The compact and lightweight 8.5×21 U-Series Papilio II Binoculars combine aspherical optical elements and BAK4 Porro prisms to deliver edge-to-edge image sharpness with a 51° apparent angle of view. The optical elements are also fully multi-coated to provide a high transmission of light. With a 8.5x magnification and 21mm objectives, you obtain a notable magnification, insignificant image jitter due to unsteady hands, and a compact form factor. You can easily spot your targets with a wide 6° angular field of view and quickly bring them into focus with a center focus wheel. In addition to observing distant scenes, birds, and game, the minimum focus of 20″ allows you to study in detail close objects like butterflies, animal footprints, marks, or landscape features. To reduce image jitter while observing distant objects or for prolonged observations, you can connect the binoculars to a tripod via an integrated 1/4″-20 socket. The binoculars also feature a 2.5mm exit pupil, a 15mm eye relief, and interpupillary distance and diopter adjustments.

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SKU: DVVAJ Category:

The binoculars are very compact, lightweight, and features a single piece frame that houses objectives, which allows for a synchronized interpupillary adjustment. To accommodate eyeglasses wearers, the binoculars offer twist-up rubber eyecups. Also included are a carrying case, a neck strap, and eyepiece covers.

Optical Performance
  • BAK4 Porro prisms
  • Aspherical optical elements offer edge-to-edge image sharpness
  • Fully multi-coated optics
  • Angular field of view: 6°
  • Minimum focus of 20″
  • Interpupillary adjustment
  • Diopter adjustment
Construction Details
  • Single piece objectives’ frame allows for a synchronized interpupillary adjustment
  • Contoured body provides a comfortable grip
  • Center focus knob offers an easy focusing
  • Twist-up rubber eyecups
  • Integrated 1/4″-20 tripod socket

Technical Specifications:



Objective Lens Diameter

21 mm

Angle of View

6° (Actual)

Field of View

315′ @ 1000 yd / 105 m @ 1000 m

Minimum Focus Distance

1.6′ / 0.5 m

Exit Pupil Diameter

2.5 mm

Eye Relief

15 mm

Diopter Adjustment


Focus Type



4.6 x 4.3 x 2.1″ / 11.6 x 11 x 5.3 cm


10.2 oz / 289.2 g



5 Year’s of limited warranty against manufacturing defects (Note: Warranty is not applicable for front caps, rear caps, straps, and carry cases. Also, warranty is not applicable for physical damage).


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