Pentax 8x21 U-Series UP Binoculars (Black)

BH #PE8X21UPB • MFR #61801
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Pentax 8x21 U-Series UP Binoculars (Black)
Key Features
  • Aspherical Lens Elements
  • BAK4 Porro Prisms
  • Fully Multicoated Optics
  • Angle of View: 6.2°
The compact and lightweight black 8x21 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 8x 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 6.2° 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 2.6mm exit pupil, a 13mm eye relief, an interpupillary and a diopter adjustments.
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Pentax UP 8x21 Overview

The compact and lightweight black 8x21 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 8x 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 6.2° 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 2.6mm exit pupil, a 13mm 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 glass wearers, the binoculars offer sliding 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 multicoated optics
  • Angular field of view: 6.2°
  • Interpupillary adjustment
  • Diopter adjustment
Construction Details
  • Single-piece objective frame allows for a synchronized interpupillary adjustment
  • Contoured body provides a comfortable grip
  • Center focus knob offers an easy focusing
  • Sliding rubber eyecups
UPC: 027075288782

Pentax UP 8x21 Specs

Key Specs
Prism Type
Porro
Magnification
8x
Objective Lens Diameter
21 mm
Angle of View
6.2° (Actual)
Field of View
325.5' @ 1000 yd / 108.5 m @ 1000 m
Exit Pupil Diameter
2.6 mm
Prism Type
Porro
Performance
Magnification
8x
Objective Lens Diameter
21 mm
Angle of View
6.2° (Actual)
Field of View
325.5' @ 1000 yd / 108.5 m @ 1000 m
Minimum Focus Distance
9.2' / 2.8 m
Exit Pupil Diameter
2.6 mm
Eye Relief
13 mm
Diopter Adjustment
Yes
Focus Type
Center
Features
Fogproof
No
Environmental Resistance
No
General
Dimensions
4.3 x 3.3 x 1.9" / 11 x 8.3 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 2.3"

Pentax UP 8x21 Reviews

ECD Optics

By Scott
Rated 5 out of 5
Date: 2026-03-02

Compact quality, 8X is puurfect, navy color is koolest and B&H is the place to do business!

Solid build, good optics

By Gregory
Rated 5 out of 5
Date: 2024-01-02

I bought the first pair as pocket binos for my birder adult son, but when I saw how solid they were and easy to use I got a second pair for my 5 year old budding birder grandson. They fit his hands perfectly, nice and light yet sturdy, and not too wide at all for his eyes. He'll use them for years. Also, minimum focus length seems less than the stayed 9 ft, so that's an unexpected benefit.

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What is the difference between this UP model and ...

What is the difference between this UP model and the UCF R 8x21 model?
Asked by: David
Pentax 8x21 UCF R Binocular B&H # PE8X21UCFR comes with the Pentax "Worry Free" warranty. The Pentax 8x21 U-Series UP Binocular, comes in three different colors with the Pentax Limited 25-Year Warranty
Answered by: John
Date published: 2023-03-09

Are these at least water "resistant" in heavy ...

Are these at least water "resistant" in heavy rain? I understand they are not the waterproof version, but I don't plan on submerging them in water. Thanks in advance.
Asked by: Anonymous
A very difficult question to answer. To a certain point all binoculars should survive a rain shower. Some better than others, as long as you dry them off as soon as possible.
Answered by: John
Date published: 2023-03-09

question

What is the minimum focusing distance? Specs say 59 feet, general discussion says 9 feet. That's a yuge difference. What are the actual specifications for these binoculars?
Asked by: Anonymous
The minimum focus distance for the Pentax U series is 9.24'.
Answered by: John P.
Date published: 2023-03-09
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