Pentax 8.5x21 Papilio Binoculars with Case

Named for the Latin word for butterfly, PENTAX Papilio 8.5x21 Binocularsrs are the perfect choice for insect observation in the field and in museums and galleries. The enhanced observation capability of the Papilio binoculars is made possible by a PENTAX Convergent Lens Optical System Engineering (CLOSE mechanism. The CLOSE mechanism automatically slides the left and right objective lenses toward the center when the focus is fixed at a short distance.

Pentax 8.5x21 Papilio Binoculars Features:
- Ideally suited for viewing insects, birds, artwork or any other object at close ranges
- C.L.O.S.E. (Convergent Lens Optical System Engineering) allows them to focus down to 1.6 feet
- Tough rubber covered exterior provides a sure grip and protects the internal mechanisms
- Sleek, contemporary ultra-compact body with unibody construction
- Revolutionary dual-axis, single body housing with synchronized eye-piece adjustment to assure correct optical alignment for comfortable viewing
- Fast and easy center focusing for handling ease
- Helicoid eyepiece rings for extra viewing comfort
- Fully multi-coated optics to eliminate harmful ultraviolet rays while improving light transmission for high contrast images with no glare or flare
- High quality BaK4 prisms transmit more light at the edges to enhance illumination for easier viewing in dim light

Pentax 8.5x21 Papilio Binoculars Specifications:
Binocular Type: Center focusing, porro-prism
Lens Construction: Objective Lens: 2 elements in 1 group
Eyepiece Lens: 5 elements in 5 groups
Magnification: 8.5X
Objective Lens Diameter: 21mm
Real Field of View: 6.0 degrees
Apparent Field of View: 51 degrees
Field Of View At 1000 Meters: 105m
Field of View at 1000 Yards: 315 ft.
Exit Pupil: 2.5mm
Eye Relief: 15mm
Prism: Porro
Relative Brightness: 6.3
Diopter Adjustment Range: +/- 4m -1
Diopter Adjustment: Click-stop adjuster built in right eyepiece
Eye Distance Adjustment Range: 56mm-74mm (2.2" - 2.9")
Focusing Range: Approx. 0.5m (1.6 ft.) to infinity
Eyepiece Ring: Helicoid type
Body Color: Black & dark gray
Height Width: 116mm x 110mm (4.6" x 4.3")
Thickness: 55mm (2.2")
Weight: 290g (10.2 oz.)
Accessories: Eyepiece lens caps, Case, Neck strap
Vergence Correction: Focus-coupled correction mechanism