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February 23, 1996
8x 42, 10x 42 and 12x 50 EXPS I Series
Porro-Prism Binoculars
The Popular Choice for Bird and Nature Watchers
8x42 EXPS I 10x42 EXPS I
8x42 EXPS I 10x42 EXPS I
12x50 EXPS 1
12x50 EXPS I
* These products are not available in Japan
Olympus Optical Co., Ltd. is pleased to introduce the high-end 8x 42, 10x 42 and 12x 50 EXPS I porro-prism binoculars.
These binoculars are popular among the hard core bird and nature watcher. They provide bright, clear vision through Olympus' special coating process. First, glare was removing by coating all the lens surfaces. An UV coat was then applied to reduce the number of UV rays that penetrate making the binoculars gentle on the eyes. Transmissivity has also been raised by keeping the loss of light to a minimum through the exclusive use of glass lenses and BaK4 prisms.
The binoculars also feature long eye relief, making it easy to use even with glasses on. The large focusing knob also makes it easy to adjust the focus. The binoculars feature a stylish and ergonomic design with a refined easy to grip rubber body, streamlined design and beautiful curves. In addition, the 8x 42, 10x 42 and 12x 50 EXPS I binoculars come equipped with a strap and a case, which is made of suede.
Main features
1.  Coating system
The multi-layer coating system removes glare, cuts UV rays and generates a bright, clear image.

2.  Lead-free glasses
Olympus not only makes binoculars to be enjoyed outdoors, it uses environmentally friendly lead-free glasses. With Olympus, the environment is always in focus.

3.  Usability
Long eye relief, adjustable eyepieces, large focusing knob, rubber-encased body and sleek design provide both functionality and style.

  8x42 EXPS I 10x42 EXPS I 12x50 EXPS I
Type Roof prism type binoculars
Magnification 8x 10x 12x
Effective Diameter of
Objective Lens
42 mm (in dia.) 50 mm (in dia.)
Diameter of Exit Pupil 5.3 mm (in dia.) 4.2 mm (in dia.)
Actual Field of View 6.5° 5.5° 4.6°
Apparent Angle of View 52.0° 55.0° 55.2°
Field at 1000 m 114 m 96 m 80 m
Brightness 28 18 18
Eye Relief 18 mm 18 mm 18 mm
Diopter Adjustment Range Over +-2 m-1
Eye Interval Adjustment Range 60-70 mm
Near Focus Distance 4 m 4 m 6 m
Weight 780 g 785 g 910 g
Width (at maximum eye interval) 187 mm 187 mm 192 mm
Length 130 mm 130 mm 163 mm
(at maximum eye interval)
57 mm 57 mm 62 mm
Lens Composition 7 elements in 5 groups 8 elements in 6 groups
Coating Full Multi-coating
Features Long Eyerelief and Adjustable Eyepieces (Twist up/down)
High-index Bak4 Prisms
Environmentally-friendly Lead-free Glasses
*Olympus Optical Co., Ltd. was changed to OLYMPUS CORPORATION as of October 1, 2003.
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