Pentax's highly portable and functional 10x25 U-Series UP WP Compact Binoculars employs an innovative unibody design that locks the objective lenses into the body with the eyepieces set on a synchronized dual-axis mechanism that ensures they stay symmetrical in relation to the center axis of the optic when adjusting the interpupillary distance. The 25mm objective lenses are fully multicoated to reduce reflection and maximize light transmission to produce the brightest images possible. Aspherical lens elements virtually eliminate distortion, especially around the edges, and corrects for lens astigmatism which can prevent sharp focusing.

Designed for easy carrying and stowing, the binocular features a lightweight fiberglass reinforced polycarbonate housing that is corrosion and impact resistant. The housing material is also temperature-resistant allowing for its use in extreme climates while reducing expansion and contraction wide temperature variations can cause, which can make the optical components move out of collimation over time. Its optical tubes are nitrogen-filled and O-ring sealed so they can are submersible to 3.3', as well as fogproof in all weather conditions.

BAK4 Porro Prisms    Fully Multicoated Optics    Angle of View: 50°    Nitrogen-Filled, Water and Fogproof    Reinforced Polycarbonate Housing    Synchronized Eyepiece Adjustment    Center Focusing    Standard 1/4"-20 Tripod Mount    Twist-Up Eyecups

• 10x magnification
• 25mm objective lenses
• BAK4 porro-prism optical design
• Aspherical lens elements reduce distortion at the edges and corrects for lens astigmatism which can prevent sharp focusing
• Anti-reflection fully multicoated optics
• 262.5' field of view at 1000 yards
• 50° angle of view

• Dual-axis synchronized eyepiece adjustment ensures symmetrical placement when changing interpupillary distances
• Knurled center focus wheel
• Twist-up eyecups for use with or without eye wear
• 15mm eye relief, 2.5mm exit pupil
• Standard 1/4"-20 tripod mount

• Lightweight fiberglass reinforced polycarbonate housing
• Housing is corrosion, temperature and impact-resistant
• Nitrogen-filled for fogproof performance, submersible to 3.3' (1m)
• Rubberized armoring protects against impacts and provides slip-resistant grip
• Inner focusing mechanism provides smooth focus while preserving waterproof seals

Related Questions and Answers

Q: 1. What is the outer diameter of the lens barrel? I'd like to attach solar filters on these.

A: The Pentax 20x60 S-Series SP WP Binoculars are about 86mm in diameter so this Daystar filter would be a good fit: https://bhpho.to/3qFnkJe

Q: 2. How does the 8 X 43 Z-Series' Hybrid Aspherical Lens Elements compare to its ED cousins in terms of refractive and abbe indexes?

A: The ED version will be significantly higher resolution and much brighter

Q: 3. Made in China?

A: The Pentax 10x42 S-Series SD WP Binocular is made in the Philippines.

Q: 4. how do they compare optica llyto the SD version? I don't spot diopter correction in these

A: The right eyepiece has a diopter adjustment. If you are referring to the Pentax 8x42 S-Series SD WP Binoculars BH #PE8X42SDWP • MFR #62761. The Pentax 8x43 Z-Series ZD WP Binoculars BH #PE8X43ZDWP • MFR #62721 has a Magnesium Alloy Chassis and a narrower field of view

Q: 5. For moon and stargazing, what reasonable tripod would you recommend to use with the Pentax 10x50 SP WP ?

A: To mount the Pentax 10x50 S-Series SP WP Binoculars on a tripod one needs an adapter like the Pentax TP-3 Tripod Adapter (f/ Binoculars w/ a 1/4"-20 Threaded Tripod Socket), BH #PETAPCFQ (https://bhpho.to/3avpVxS). For a tripod one can use the Vanguard VEO 2 PRO 233AO Aluminum Tripod with PH-28 Tripod Head, BH #VAVEO2P233AO (https://bhpho.to/3PBhmkb).

Q: 6. Is the interpupillary distance adjustable to fit the varying distances of the eyes in wide and/or narrow faces?

A: The IPD range on these goes from a minimum distance of 5.6cm up to 7.4cm, which as you can see by comparing the IPD with others is a good range for a bin in this class and means they should accommodate most people.

Q: 7. is the minimum focus distance of more than 56 feet correct? That would make these the longest focusing bins in history.

A: The minimum focus distance is 8.2 ft.

Q: 8. Where is it made?

A: The Pentax 8x42 S-Series SD WP Binoculars are made in the Philippines.

Q: 9. is this considered a compact binocular?

A: Indeed it is.

Q: 10. The protective covers for the lenses are not tight enough to stay on - what's a good alternative? Also, what would be a good carrying case for these?

A: While we are not aware of alternative lens covers we can tell you that the Lowepro Photo Traveler 150 Backpack (Mica) is a great option for a carrying case, BH #LOPT150.