With an eye for the discerning nature enthusiast, the Pentax Z-Series ZD ED Binocular features multiple optical technologies to improve the image quality and ensure accurate colours in all weather and lighting conditions.The image-enhancement starts with hybrid aspherical lens elements and extra-low dispersion (ED) glass. The aspherical elements eliminate distortion around the edges of the lens for clear edge-to-edge views and correct lens astigmatism that can prevent the ability to bring subjects into sharp focus. ED glass corrects for chromatic aberration to ensure colours are accurately rendered. Anti-reflection fully multi coated optics maximise light transmission through the entire optical path to make views appear bright and crisp, especially in low light. Finally, the BAK4 roof prisms are phase-corrected to enhance contrast and further correct chromatic aberration. These technologies work together to produce bright and clear high-contrast images with accurate colours and virtually no distortion.Complementing the optical performance is a housing that is built for a lifetime of rugged outdoor use. The chassis is made of a lightweight and durable magnesium alloy with a rubberized armour that protects against impacts while providing a slip-resistant grip. The optical tubes are nitrogen filled for fogproof performance and O-ring sealed to make the binocular submersible to as much as 3.3'. An protective external lens coating helps to repel dust, water, and oil to ensure obstruction-free viewing. For longer glassing sessions, they are tripod mountable with an optional adapter.Optical Performance- 43mm objective lenses- BAK4 Roof prism optical path- Anti-reflection fully multi coated optics- Extra-low dispersion (ED) glass reduces chromatic aberration for sharper images with accurate colour- Phase corrected prisms produce high-contrast images with true colour rendition- Hybrid aspherical lens elements correct for spherical aberrations to reduce distortion at the edges of the lens and corrects for astigmatism that can prevent sharp focusingUse and Handling- Closed bridge configuration- Large knurled centre focus wheel- Right-eye diopter adjustment- Twist-up eyecups for use with or without eye wear- Tripod mountable with optional adapterConstruction Details- Lightweight and durable magnesium alloy housing- Rubberized armoring protects against impacts and provides slip-resistant grip- Nitrogen-filled, fogproof and submersible to 3.3' (1m)- Internal focusing system helps to maintain waterproof seals- Dust/water/grease repellent coatings keeps the optical surfaces cleanSpecifications:- Prism Type: Roof- Objective Lens Diameter: 43 mm- Tripod Mount: Yes (Adapter Optional)- Weight: 25.2 oz / 714.4 gIn the Box:- Pentax Z-Series ZD ED Binocular- Neck Strap- Carrying Case with Strap- 2 x Objective Lens Caps- 2 x Eyepiece Caps