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Glossary Binoculars

A

Aspherical lens

A non-aspherical lens element that helps to reduce chromatic and other lens aberrations.

D

Doublet Field flattener

A double lens group that compensates for curvature of field, ensuring excellent image flatness and clarity.

L

Long eye relief

Allows users who wear glasses to see the entire image.

O

Optical Image Stabilizer

A computer-controlled Vari-Angle Prism (VAP) system that compensates for movement to provide a dearer view.

P

Porro prism

A combination of right-angle prisms that ensures the image is the right way up for viewing. The use of prisms also shortens the distance between the objective and eyepiece lenses, reducing the size and weight of the binoculars.

R

Roof prism

Performs a similar function to the Porro prism, but can be fitted in a straight barrel for a streamlined appearance.

Rubber coating

Cushions the binoculars against shocks and makes them easier to grip.

S

Super Spectra Multicoating

Extremely thin layers of chemicals applied to the surfaces of selected lenses and prisms to reduce unwanted reflections. This improves image sharpness, contrast and colour balance

W

Waterproof

Will survive submersion up to one metre underwater for 5 minutes. Not suitable for use underwater.

Weatherproof

Can be used in rain or snow and rinsed in running water to remove mud and dirt.

Wide-angle

Binoculars with an apparent field of view greater than 65º offering a broader scope of view.

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