Olympus 12 x 25 PC I Silver Binocular

How to read binocular specifications
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The Olympus 12x25 PC I Binoculars: Compact and Lightweight Binos for Sightseeing and Spectator Sports

For when portability is as important as optical quality there is the Olympus PC I series of binoculars; aimed at the urban dwelling sports and sightseeing enthusiast, the 12x25 model features a sleek, stylish design yet compact dimensions.

These standard porro prism type binos feature a multi-coated lens for maximum image brightness and contrast, high quality optics, plus the added worry-free feature of UV (ultraviolet) protection. They’re ideal for bird watching, taking out with you camping or hiking, when going travelling, or even accompanying you to a sporting event. Added to the mix are precisely ground prisms and lenses made of brightness-enhancing barium crown glass (Bak-4) to ensure clarity and brightness to the very edge of the field of view.

Peace of mind and years of pleasure are further guaranteed thanks to a 25-year European warranty.

Exit pupil explained
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Small Wonder, Big Scope

This particular model offers 12x magnification and a 25mm objective lens diameter. As it sounds, 12x magnification produces an image that appears as if the user were ten times closer to their subject, while the objective lens diameter refers to how much light can be gathered to form that image. For daytime use a lens diameter of 21 to 25mm (as here) is ideal.

Also worth taking note of is the exit pupil. Here that is 3.1mm, which for 12x25 binoculars is arrived at via 25 divided by 12 = 2.1 exit pupil in mm, so in line with the 2-3mm which is generally thought of as being suitable for daylight use. Another thing to take into account is the field of view, which here is 79 metres, and is defined as the width of the viewable field at a distance of 1000m from the point of observation. Closest focusing distance is 3.5 metres.

Angle of view
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Versatile and Bright, and Adaptable to Suit your Individual Viewing Needs

Offering a 12x magnification to bring faraway points of interest that much closer plus a 25mm objective lens diameter, the Olympus 12x25 PC I Binoculars incorporate multi coated lenses to deliver maximum image brightness, visual impact and image defining contrast.

Fast and easy focusing is provided courtesy of a large, centrally placed knob. The 12x25 PC I model further sports a long 16mm eye relief for extra comfort, plus diopter adjustment to allow them to be attuned to an individual’s eyesight for comfortable viewing without glasses.

Prism types explained
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Engineered for Excellence, Built for Convenience

Boasting a tactile and ergonomic design and weighing 280g, the Olympus 12x25 PC I measurements are a manageable 114x98x48mm, while the package includes a neck strap, case and protective lens covers.

In summary, with a lens configuration of 8 elements in 6 groups, and a 16 mm eye relief, the field of view at 1000m is 79m. The actual field of view is 4.5° while the apparent angle of view is 54°.

These are also binoculars that will repay your original investment with years of good service. A case in point: a 25-year warranty is included with any purchase.

Model	12x25 PC I	10x25 PC I	8x25 PC I
Magnification	12x	10x	8x
Objective Lens Diameter	25mm	25mm	25mm
Exit Pupil	2.1	2.5	3.1
Relative Brightness	4.3	6.3	9.8
Actual Field of View	4.5°	5.5°	6°
Field of View at 1000m	79m	91m	105m
Apparent Angle of View	54.0°	52.0°	48.0°
Near Focus Distance	3.5m	2.5m	2.5m
Eye relief	16mm	15mm	16.5mm
Adjustable Eyepiece	•	•	•
Dioptric Correction	>± 2m¹	>± 2m¹	>± 2m¹
Eye interval adjustment range	58-70mm	58-70mm	58-70mm
Weight	280g	280g	280g
Dimensions WxHxD	114x98x48mm	114x98x48mm	114x98x48mm
Prism Type	Porro	Porro	Porro
General Use	•	•	•
Boating
Travelling	•	•	•
Camping / Hiking
Bird Watching
Sports / Events	•	•	•
Astronomy
Theatre / Indoor Events