Pentax 10x21 U-Series UP Binocular (Black)

Pentax 10x21 U-Series UP Binocular (Black)

Pentax 10x21 U-Series UP Binocular (Black)

B&H # PE10X21UPB MFR # 61804
Pentax 10x21 U-Series UP Binocular (Black)

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Value: $9.99

Product Highlights

  • Aspherical Lens Elements
  • BAK4 Porro Prisms
  • Fully Multicoated Optics
  • Angle of View: 5°
  • Center Focusing
  • Sliding Eyecups
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Color: Black

Pentax 10x21 U-Series UP Binocular (Black) Pentax 10x21 U-Series UP Binocular (Navy) Pentax 10x21 U-Series UP Binocular (Pink)

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  • 1Description

The compact and lightweight black 10x21 U-Series UP Binocular combines aspherical optical elements and BAK4 Porro prisms to deliver edge-to-edge image sharpness with a 50° angle of view. The optical elements are also fully multicoated to provide a high transmission of light. With an 10x magnification and 21mm objectives, you obtain a higher than average magnification and a compact form factor. You can easily spot your targets with a wide 5° 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 9.2' allows you to study in detail close objects like animal footprints, marks or landscape features. The binocular also features a 2.1mm exit pupil, a 9.5mm eye relief, an interpupillary and a diopter adjustments.

The binocular is very compact, lightweight, and features a single piece frame that houses objectives, which allows for a synchronized interpupillary adjustment. To accommodate eye glasses wearers, the binocular offers sliding rubber eyecups. Also included are a carrying case, a neck strap, and eyepiece covers.

Optical Performance
  • Aspherical optical elements offer edge-to-edge image sharpness
  • BAK4 Porro prisms
  • Fully multicoated optics
  • Angular field of view: 5°
  • Interpupillary adjustment
  • Diopter adjustment
Construction Details
  • Single main piece allows for a synchronized interpupillary adjustment
  • Contoured armoring provides a comfortable grip
  • Center focus knob offers an easy focusing
  • Sliding rubber eyecups
UPC: 027075288812
Prism Type Porro
Magnification 10x
Objective Lens Diameter 21mm
Angle of View (actual)
Field of View 262.5' @ 1000 yd / 87.5 m @ 1000 m
Minimum Focus Distance 59.4' / 18.1 m
Exit Pupil Diameter 2.1 mm
Eye Relief 9.5 mm
Interpupillary Adjustment Not Specified by Manufacturer
Dioptric Correction Not Specified by Manufacturer
Focus Type Center
Tripod Mount Not Specified by Manufacturer
Dimensions 4.3 x 3.1 x 1.9" / 10.9 x 8.0 x 4.8 cm
Weight 7.4 oz / 209.8 g
Packaging Info
Package Weight 0.7 lb
Box Dimensions (LxWxH) 4.6 x 4.0 x 2.4"
10x21 U-Series UP Binocular (Black) is rated 3.0 out of 5 by 2.
Rated 3 out of 5 by from more info The eye relief is listed as 9.5mm, almost a centimeter. However, the eyecups extend significantly less than that, yet it's not possible to get full field of view at that extension, so I do not believe their eye relief spec.The lifetime warranty it turns out only applies during the time period that Ricoh (owner of Pentax) considers to be the product lifetime, i.e. as long as they choose to keep parts for it. That might be 10 years, or it might be 2 years; they don't say.I am returning the product because of unusable eye relief.
Date published: 2017-02-27
Rated 3 out of 5 by from Good optics; several drawbacks The optics are quite good, with good sharpness toward the edge of the field, though not quite as good as similar Nikons I got 20 years ago.There are some negatives, though.* The eyecup conversion is push-pull. That's fine, but if you leave the eyecups pulled out, the binoculars no longer fit in the case.* In addition, with the eyecups out (i.e., not wearing glasses) the cups have to be pressed right into your eyes to reach within the eye relief point, making it uncomfortable if you happen to have eyelashes.* The diopter adjustment is hard to turn, making it difficult to adjust while looking through the glasses. But, at least there is one.* Although there are 2 strap anchors, the provided strap is only a wrist strap for a single anchor point.* In addition, the anchor points are very small, making it difficult if not impossible to attach a real strap.* The lens covers do not fit well and fall right off. Expect to lose them in short order.
Date published: 2017-02-22
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