Jupiter III 8x21

Weighing only 4.6 ounces, these feather-light binoculars are ideal for casual use. Yet despite their diminutive size, the PENTAX 8x21 Jupiter III still comes standard with premium PENTAX features. High-quality BaK4 prisms and smc optics for superior image quality and minimal glare. Rubber eyepiece rings for viewing comfort. And a compact, ergonomic body design that fits neatly into a pocket or purse. Whether attending a sporting event, traveling, or hiking, the PENTAX 8x21 Jupiter III binocular provides great optics at an affordable price.


  • Take your binoculars anywhere with an inverted porro prism design that results in a ultra lightweight, compact body. The PENTAX 8x21 Jupiter III’s weigh only 4.6 ounces.

  • See your subjects more clearly with fully multi-coated optics that eliminate harmful ultraviolet rays while improving light transmission for high contrast images with no glare or flare.

  • Enjoy extra viewing comfort with rubber eyepiece rings and a wide field of view.

  • View your subjects easily in dim light with high-quality BaK4 prisms that transmit more light at the edges to enhance illumination.

  • Focus on nearby subjects with a short minimum focusing distance of approximately 15 feet.

  • The PENTAX 8x21 Jupiter III binoculars are protected by a limited lifetime warranty.

Focusing Range

15' to infinity Height & Width

Objective Lens Diameter




Real Field Of View

7.0 degrees

Field Of View At 1000m


Binocular Type

Porro prism, center focusing

Field Of View At 1000y

369 ft

Exit Pupil


Eye Relief


Relative Brightness


Eye Width Adjustment Range


Height Width

3.0” x 4.2” (775mm x 106mm)




4.6 oz.

  • Eye Lens Caps (69536)
  • Strap (69361)

  • Case (69616)


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