Pentax 10x21 U-Series UP Binoculars (Navy)

BH #PE10X21UPN • MFR #61805
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Pentax 10x21 U-Series UP Binoculars (Navy)
Key Features
  • Aspherical Lens Elements
  • BAK4 Porro Prisms
  • Fully Multicoated Optics
  • Angle of View: 5°
The compact and lightweight navy 10x21 U-Series UP Binoculars combine 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 binoculars also feature a 2.1mm exit pupil, a 9.5mm eye relief, an interpupillary and a diopter adjustments.
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Pentax UP 10x21 Overview

The compact and lightweight navy 10x21 U-Series UP Binoculars combine 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 binoculars also feature a 2.1mm exit pupil, a 9.5mm eye relief, an interpupillary and a diopter adjustments.

The binoculars are 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 binoculars offer 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: 027075288829

Pentax UP 10x21 Specs

Key Specs
Prism Type
Porro
Magnification
10x
Objective Lens Diameter
21 mm
Angle of View
5° (Actual)
Field of View
262.5' @ 1000 yd / 87.5 m @ 1000 m
Exit Pupil Diameter
2.1 mm
Prism Type
Porro
Performance
Magnification
10x
Objective Lens Diameter
21 mm
Angle of View
5° (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
Diopter Adjustment
Yes
Focus Type
Center
Features
Fogproof
No
Environmental Resistance
No
General
Dimensions
4.3 x 3.1 x 1.9" / 10.9 x 8 x 4.8 cm
Weight
7.4 oz / 209.8 g
Packaging Info
Package Weight
0.7 lb
Box Dimensions (LxWxH)
4.6 x 3.8 x 2.5"

Pentax UP 10x21 Reviews

Great for travel

By Michael
Rated 5 out of 5
Date: 2019-12-24

Friends of ours had these during a recent cruise vacation. So, we ordered our own set. These are great for travel. Lightweight, easy to use. Surprisingly good optics for the size and the price. (I am a hunter, so I use higher end optics for hunting, but I spend quite a bit more than what these cost for my hunting binoculars.) I would recommend these for travel, for backpacking (where size and weight might matter), and for anytime you just want a convenient set of binoculars.

more info

By ALBERT
Rated 3 out of 5
Date: 2017-02-27

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.

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