Pentax UCF R 10x21

• Compact 10x magnification: The 10x21 format brings distant details closer while keeping the binocular small enough for everyday carry, making it practical for travel, events and casual outdoor observation.
• Porro prism optical design: The Porro prism system helps deliver a bright, well-defined image in a compact body, giving this pocket binocular a more spacious view than many ultra-slim designs.
• Multi-coated optics with BaK4 prisms: Coatings and high-refraction prism glass improve light transmission and contrast, which helps maintain a clearer image in mixed lighting and indoor viewing.
• Dual-axis eye-distance adjustment: PENTAX’s linked-dual-axis design makes interpupillary adjustment quick and easy, which is especially useful when the binocular is shared between different users.
• Waterproof, fogproof construction: Nitrogen filling and sealed construction help the binocular stay reliable in damp weather and changing temperatures, reducing the risk of internal fogging in the field.

About the Pentax UCF R Series

The Pentax UCF R series is a compact Porro-prism binocular family built for users who want a small, easy-to-carry optic without moving to a very narrow roof-prism format. Positioned as a portable everyday series, it combines 21 mm objective lenses with a palm-sized body suited to travel, sightseeing, indoor performances and casual nature observation. The series is designed around practical handling as much as optical performance, with PENTAX’s dual-axis eye-distance adjustment system making it faster to set the binocular to different faces and easier to share between users.

Across the series, Pentax emphasizes a bright, clean image through multi-coated optical elements, BaK4 glass prisms and aspherical optical elements that help control edge distortion. The result is a compact binocular line that aims for a clear, well-defined image rather than simply the smallest possible shape. Rubber-armored housings improve grip and day-to-day durability, while the center-focusing layout keeps operation familiar and straightforward. In short, the UCF R series is intended for users who value portability, simple handling and dependable optical quality in a compact binocular for general-purpose viewing.

About the Pentax UCF R 10x21

The Pentax UCF R 10x21 is the higher-magnification model in this compact series, built for users who want more reach from a binocular that still fits easily into a jacket pocket or small bag. Its 10x magnification is useful for pulling in distant architectural details, stage action, wildlife or landscape features that can look too small through lower-power pocket binoculars. At the same time, the 21 mm objective lenses keep the body light at 210.00 g, so it remains practical for day trips, travel and event use where larger binoculars would be left behind.

The optical system uses a Porro prism design with multi-coated elements, high-refraction BaK4 prisms and aspherical optical elements. In practice, this supports a bright, crisp image with good contrast and better edge definition than many basic compact binoculars. The 87.00 m/1000m field of view keeps the image controlled and purposeful for distance viewing, while the 2.80 m close focus adds flexibility for nearby subjects. A central focusing system keeps operation quick, and the +/- 4 dpt. diopter range helps fine-tune the view to the user’s eyesight.

Mechanically, the binocular is designed for frequent carrying and shared use. The linked dual-axis eye-distance adjustment system makes setup fast, the slide-type eyepiece rings simplify storage and deployment, and the waterproof, fogproof, nitrogen-filled construction adds reassurance in wet weather and changing temperatures. For users seeking compact hunting optics for casual observation, travel binoculars or a small general-purpose field glass, this model balances reach, portability and straightforward handling well.

About Pentax

Pentax traces its history to Asahi Optical Joint Stock Co., founded in 1919 in Otsuka, Tokyo. The brand began as an optical manufacturer producing eyeglass lenses and binoculars, and that background still shows in its long-standing focus on practical optical design. Today, Pentax camera and binocular products are manufactured and marketed by Ricoh Imaging Company, Ltd., a Tokyo-based company that manufactures, sells and services cameras and other optical equipment.

The modern corporate structure was shaped by two major changes: Asahi Optical Co., Ltd. merged with HOYA Corporation in March 2008, and Ricoh acquired HOYA’s imaging-system businesses in 2011. Within sport optics, Pentax is known for binoculars that combine solid mechanical design with proven optical features such as full multi-coating on lens surfaces and prism incident-light surfaces. Its range covers binoculars, cameras and interchangeable lenses, reflecting a broad but clearly optics-centered product heritage.

Main Features

• Product type: Pocket binoculars
• Binoculars series: Pentax UCF R
• Magnification: 10.00 x
• Objective lens diameter: 21.00 mm
• Prism type: Porro
• Lens coating: Multicoated
• Field of view: 87.00 m/1000m
• Field of view (angular): 4.98 °
• Exit pupil: 2.10 mm
• Eye relief: 9.50 mm
• Close focus: 2.80 m
• Diopter adjustment range: +/- 4 dpt.
• Focusing system: Central
• Interpupillary distance: 58.00 mm - 72.00 mm
• Waterproof: Yes
• Fogproof: Yes
• Nitrogen filled: Yes
• Dimensions: 78.00 mm x 110.00 mm x 48.00 mm
• Weight: 210.00 g
• Body color: Black
• Country of manufacture: Japan

Warranty

30 years. Pentax covers this binocular with a 30-year warranty, providing long-term support for a compact optic intended for regular travel, leisure and field use.

In the Box

• Eyepiece lens cap
• Case
• Strap