Pentax S-Series SP BAK4 Porro Prism Multi-coated Binoculars
Designed for both astronomical and terrestrial use, Pentax's 12x50 /16x50 S-Series SP Binocular features large oversized fully multi coated 50mm objectives to reduce reflection and maximise light transmission through the entire optical path. Utilising the traditional porro prism configuration gives scenes a rich depth of view for an immersive observation experience and provides a comfortable feel in the hand with a lot of surface area to maintain a sure grip. The large objectives and coatings maximise the amount of light getting to the user's eyes for exceptional low-light capabilities, and its high 10x 12x 16x magnification provides an immersive observation experience whether users are bird watching or comet hunting.
The binocular sports a generous 13mm (8x40, 12x50) 11mm (12x50) eye relief and the fold-down eyecups seal against the ocular cavity to block stray peripheral light which can dim images. Its over-sized objectives add weight and bias the centre of gravity forward making user fatigue a concern and hand-shaking a possibility, so to aid long observation sessions the binocular can be mounted on a tripod using an optional adapter.
Designed to provide an immersive experience for nature and bird watching, Pentax's 8x40 S-Series SP Binocular boasts a wide 65.6° angle of view and porro prisms that produce a rich depth of view. The 40mm objectives are fully multicoated to reduce reflection and maximise light transmission through the entire optical path without making them overly cumbersome for a long day on the trail. The coatings ensure bright and clear high-contrast images even in low-light, and its utilitarian 8x magnification brings subjects close while maintaining a wide 430' field of view at 1000 yards to preserve situational awareness. The binocular sports a 13mm eye relief and the fold-down eyecups seal against the ocular cavity to block stray peripheral light which can dim images.
Optical Performance
- 8x 10x 12x 16x magnification
- 50mm objective lenses
- BAK4 porro prism optical path
- Anti-reflection fully multi coated optics
Use and Handling
- Closed bridge configuration
- Large knurled centre focus wheel
- Right-eye diopter adjustment
- Fold-down rubber eyecups seal against ocular cavity and block stray peripheral light
Construction Details
- Internal focusing system (8x40)
- Rubberized armoring protects against impacts and provides slip-resistant grip
- Tripod mountable with optional adapter
Specifications:
- Prism Type: Porro
- Magnification: 8x 12x 16x
- Objective Lens Diameter: 40 mm (8x) 50mm (12x, 16x)
- Angle of View:
8.2° (8x)
5.6° (12x)
3.5° (16x)
- Field of View:
430.4' @ 1000 yd / 143.5 m @ 1000 m (8x)
294.0' @ 1000 yd / 98.0 m @ 1000 m (12x)
183.7' @ 1000 yd / 61.2 m @ 1000 m (16x)
- Minimum Focus Distance:
127.8' / 39 m (8x)
191.5' / 58.4 m (12x)
219.5' / 66.9 m (16x)
- Exit Pupil Diameter:
5.0 mm (8x)
4.2 mm (12x)
3.1 mm (16x)
- Eye Relief: 13 mm
- Interpupillary Adjustment: Not Specified by Manufacturer
- Dioptric Correction: Not Specified by Manufacturer
- Focus Type: Center
- Tripod Mount: Yes (Adapter Optional)
- Dimensions:
7.4 x 5.2 x 2.2 Inches / 18.8 x 13.2 x 5.6 cm (8x)
7.8 x 6.3 x 2.3 Inches / 19.8 x 16.0 x 5.8 cm (12x)
7.8 x 6.5 x 2.3 Inches / 19.8 x 16.5 x 5.8 cm (16x)
- Weight:
27.2 oz / 771.1 g (8x)
31.00 oz / 878.85 g (12x)
32.00 oz / 907.20 g (16x)
In the Box:
- Pentax 8x40/12x50/16x50 S-Series SP Binocular
- Neck Strap
- Carrying Case (8x40)
- Carrying Case with Strap (12x50, 16x50)
- 2 x Objective Lens Caps
- 2 x Eyepiece Caps