Bresser 8845001 Junior Astronomical Telescope 70/900 EL

A colour is a visual attribute that describes the hue or shade of an object or surface. It can be a single dominant colour, a combination of colours, or a range such as "Black, White". The value may be expressed in common names (e.g., Black, Silver) or descriptive terms (e.g., One Colour, Assorted).

The distance between the optical center of a lens and its image plane, expressed in millimetres. It can be a single value for fixed‑focal lenses or a range indicating the minimum and maximum focal lengths covered by zoom optics. This measurement helps users understand the field of view and zoom capability of cameras, lenses, and other optical devices.

The type of mechanical attachment used to secure the product, such as pushpins, steel rods, screws, or other mounting hardware. It indicates how the item is intended to be mounted on a surface or frame and helps users determine compatibility with their installation setup.

The overall linear dimension of a product measured along one axis, expressed with a standard unit such as meters, centimeters or inches. It represents the full size from end to end and is used to compare physical dimensions across similar items.

The linear measurement across the widest part of a tube, expressed in units such as millimeters, centimeters, inches or feet. It represents the outer diameter of the tube and is used to determine fit, compatibility and physical size for components or accessories that interact with the tube.

The linear dimension of a tube measured in a standard unit such as millimetres, centimetres or inches. It represents the overall length from one end to the other and is used to compare the size of tubes across similar products.