Pentax UD 10x21 Binoculars

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product overview
product overview
  • Compact "Take-Anywhere" Design
  • Roof Prism Light Path
  • Anti-Reflection Multi-coatings
  • Closed Bridge Configuration
  • Slip-Resistant Center Focus Knob
  • Twist-Up Rubber Eyecups
  • Case and Neck Strap

Compact and lightweight, the Pentax UD 10x21 Binoculars, in basic black, are an ideal go-anywhere companion for hiking, sightseeing, or taking in a concert or game. At less than 3.5" long and under 7 ounces, the UD will easily fit in your glove box, pocket, pack, or purse for any glassing needs that might arise.

Utilizing a 10x magnification brings your subject up close and personal for detailed observations and viewing without sacrificing the generous field of view, so you won't need to constantly move your head from side to side in order to see the scene in front of you. Its compact roof prism light path produces thin optical tubes for easier handling, with a slip-resistant focus knob and diopter ring to bring your view into sharp & crisp focus. Anti-reflection multi-coatings maximize light transmission and reduce ghosting and flare, so your subjects will be bright and clear with improved resolution, and twist-up rubber eyecups ensure comfortable viewing with or without corrective eyewear or sunglasses. For your convenience, the UD binoculars come with a carrying case and a neck strap

Key Features of the Pentax UD 10x21 Binoculars

  • Compact "Take-Anywhere" Design
  • Roof Prism Light Path
  • Anti-Reflection Multicoatings
  • Closed Bridge Configuration
  • Slip-Resistant Center Focus Knob
  • Twist-Up Rubber Eyecups
  • Case and Neck Strap


The Pentax UD 10x21 Binoculars, the optical system is multi-coated to prevent unnecessary light reflection, achieving excellent image performance with reduced flare and ghosting.

Large focus and diopter adjustment ring

Equipped with a large focusing ring and diopter adjustment ring. Both have a non-slip design for easy operation.

Compact design

Featuring a compact design weighing around 195g (6.870z), which is the lightest in the range of Pentax binoculars. It fits in your hand and is easy to use.

Compatible with tripod adapters

The tripod adapter, TP-3 (sold separately) will expand the number of situations where you can use these binoculars. Tripod adapters offer quick, effortless mounting of binoculars onto a tripod.

  • MPN - 61816
  • GTIN - 027075301856
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Prism System

Type Roof


Magnification 10x
Objective Lens Diameter 21 mm
Angle of View 5.4° (Actual)
Field of View 282' @ 1000 yd / 93.62 m @ 1000 m
Minimum Focus Distance 9.84' / 3 m
Exit Pupil Diameter 2.1 mm
Eye Relief 8.5 mm
Interpupillary Adjustment 58 to 72 mm / 2.3 to 2.8"
Diopter Adjustment None
Focus Type Center


Fogproof No
Water Resistance None


Dimensions 4.25 x 3.43 x 1.5" / 108 x 87 x 38 mm
Weight 6.88 oz / 195 g
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What’s In The Box
  • Pentax UD 10x21 Binoculars
  • Case
  • Neck Strap
  • Eyepiece Lens Cap x2
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