Vortex Crossfire HD 10 x 42 Binoculars HD Glass + Glasspak Case (UK Stock) BNIB

The colour or combination of colours that a product is available in, expressed as common names such as "Black", "Silver" or comma‑separated lists like "Black, White". It indicates the visual appearance of the item for consumers.

The exit pupil diameter is the linear size of the opening through which light exits an optical device, measured in millimetres (mm). It indicates how much light can pass through the system and affects brightness and field of view. This measurement helps users compare compatibility with lenses, filters or accessories that require a specific aperture.

The maximum horizontal extent that an observer can see with an optical device when positioned 1000 metres away, expressed either as a linear measurement in metres or as an angular width in degrees. It allows comparison of how wide a telescope, binoculars or other sighting instrument can cover at that distance.

The vertical dimension of a product measured from its lowest to highest point. It is expressed in a physical unit such as millimetres, centimetres or inches and applies to any item where height is relevant, including books, electronics, furniture and other objects.

The optical prism configuration used in a binocular, monocular or other optical device. It indicates whether the instrument employs a roof prism, Porro prism, BaK‑4, BK‑7, Schmidt‑Pechan or similar design, which affects image quality, size and weight.

The mass of the product expressed in a standard unit such as grams or kilograms. It represents how heavy the item is and can be used for shipping calculations, handling instructions, or consumer information.

The horizontal measurement of a product, expressed in a linear unit such as millimetres or inches. It indicates how wide the item is from one side to the other and is used for sizing, fitting, and compatibility purposes.