PRODUCT FEATURES
Bright, clear viewing
As with PENTAX’s top-end Z-series models, these new models provide sharp, high-contrast images with minimal glare and ghost images, thanks to the application of a full multi-coating process to all lens surfaces and a special coating designed to optimize light transmittance. They also feature large, 42-millimeter diameter objective lenses to deliver a bright, clear view even in unfavorable lighting conditions, such as in twilight. The PENTAX SD 7x42 ED features a large six-millimeter exit pupil, making it ideal for astronomical observation.
ED optical elements
As the first PENTAX S-series models to incorporate ED (Extra-low Dispersion) optical elements for effective compensation of chromatic aberration, these binoculars deliver a sharp, high-contrast, blur-free image of the subject.
Dependable waterproof construction for use in harsh conditions
Thanks to their dependable waterproof construction* (equivalent to JIS Class 6 standards for watertight designs submersible to a depth of one meter), these models can be used in almost all weather conditions and can be easily rinsed clean with water. The nitrogen-filled design prevents the interior lens surfaces from fogging caused by sudden temperature changes.
Other Features
• Exterior housing made of thermoplastic elastomer resin to improve holding comfort and prevent accidental slippage
• Easy-to-operate diopter adjustment mechanism with a non-slip, ring-type adjuster
• Extendible eyepieces for effortless shift between in-use and storage positions
• Easy mounting on a tripod, in combination with the optional TP-3 Tripod Adapter
Type  Roof prism, Center focusing, waterproof
Effective diameter of objective lens 42mm
Real Field of View 7.5'
Field of View at 1000m  131 m
             1000 yds  1179 ft
Exit Pupil Aperture 6.1 mm
Eye Relief 18.2 mm
Relative Brightness 37.2
Focusing Range 3.0 m to infintiy
              9.0 ft to infinity
Interpupillary distance adjustment 56-78 mm
Waterproof 1 m depth of water, Nitrogen filled