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TECHNICAL INFORMATION
We hope the following information helps you make a decision on which set of binoculars is right for you. If you need additional information or perhaps a suggestion of which model would suit you best then please give us a call 01903 200456 open every day.
TYPES OF BINOCULAR
ROOF PRISM SYSTEM - In roof prism binoculars the prisms overlap closely, allowing the objective lenses to line up directly with the eyepiece. The result is a slim, streamlined shape in which the lenses and prisms are in a straight line. Roof prism binoculars are less bulky and more rugged than an equivalent porro model.
PORRO PRISM SYSTEM - In porro prism binoculars the objective or front lens is offset from the eyepiece. Porro prism binoculars provide greater depth perception and generally offer a wider field-of-view. Because of the simplicity of this system, some of the best values can be with a porro design.
FEATURES EXPLAINED
WATERPROOF/FOGPROOF - All of our binoculars are weatherproof which means they can withstand some rain. If you require the ultimate protection against water then go for waterproof binoculars which have an O-ring seal and are nitrogen-purged for total waterproof and fogproof protection. These models can withstand complete immersion in water and stay dry inside. The interior optical surfaces won't fog due to rapid temperature change or humidity.
MAGNIFICATION (POWER) - Binoculars are often referred to by two numbers separated by an "x". For example: 8x32. The first number is the power or magnification of the binocular. With an 8x32 binocular, the object being viewed appears to be eight times closer than you would see it with the unaided eye.
OBJECTIVE LENS SIZE - The second number in the formula (8x32) is the diameter of the objective or front lens. The larger the objective lens, the more light that enters the binocular and the brighter the image.
PRISM GLASS - Most optical prisms are made from borosilicate (BK-7) glass or barium crown (BaK-4) glass. BaK-4 is the higher quality glass yielding brighter images and high edge-to-edge sharpness.
COATED OPTICS -
Lens surface coatings reduce light loss and glare due to reflection for a brighter, higher-contrast image with less eyestrain.
TYPES OF COATINGS:
Coated - A single layer on at least one lens surface.
Fully Coated - A single layer on all air-to-glass surfaces.
Multi-Coated - Multiple layers on at least one lens surface.
Fully Multi-Coated - Multiple layers on all air-to-glass surfaces.
There are other more advance coatings such as PC3 and XLT which also help provide a better quality of image.
FIELD-OF-VIEW (F.O.V.) -
The side-to-side measurement of the circular viewing field or subject area. It is defined by the width in feet or meters of the area visible at 1000 yards or meters. A wide-angle binocular features a wide field-of-view and is better for following action. Generally, the higher the magnification, the narrower the field-of-view.
EXIT PUPIL -
Refers to the size of the circle of light visible at the eyepiece of a binocular. The larger the exit pupil, the brighter the image. To determine the size, divide the objective lens diameter by the power (an 8x32 model has an exit pupil of 4mm).
EYE RELIEF -
The distance a binocular can be held away from the eye and still present the full field-of-view. Extended or long eye relief reduces eyestrain and is ideal for eyeglass wearers.
EYEGLASS WEARERS - EYECUPS
Bushnell binoculars come with twist-up, pop-up or soft rubber fold down eyecups which go down for eyeglass wearers. These options allow everyone to see the entire field-of-view.
DIOPTER ADJUSTMENT -
Included with all our binoculars this is a "fine focus" adjustment ring usually provided around one eyepiece to accommodate for vision differences between the right and left eyes.
RAINGUARD -
Bushnell's exclusive, patented, hydrophobic (water-repellent) coating on which condensation from rain, fog or snow forms in much smaller droplets than on standard coatings. Smaller droplets scatter less light, which results in increased light transmission and a clearer image. Makes the binocular useful even when looking directly into the driving rain.
PC-3 PHASE COATING -
Found on the best roof prism binoculars, this chemical coating is applied to the prisms to enhance resolution and contrast. Would not provide an advantage on porro prism models.
Still confused or just need some help please call us on 01903 200456 we are happy to help.
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