Teleskop Apollo 80 EQ

Describes the exact structure of the telescope thereby further subdividing the different types of telescope.

An achromatic is a refracting telescope (refractor), which consists of two lenses. It is the classic refractor design.

This is the distance between the objective lens or mirror and the focal point.

The ability of the optic to discern the fine detail of objects that are close together.

Light-gathering capacity of the telescope compared to the eye.

Focusers are available in 1.25" or 2" formats. Many 2" focusers also have a 1.25" adapter.

Are mainly differentiated between equatorial and altazimuth. A special type of altazimuth mount is the Dobsonian mount.

Is a type of mount set-up, whereby one axis is aligned parallel to the axis of the Earth.

Eyepieces are needed for observing. Depending on the focal length, you achieve a certain level of magnification.
The specification 1.25" refers to the diameter of the connector (1.25" = 31.8 millimetres).

A telescope always displays an object upside down. This law of optics can only be compensated for by an erecting system. Erecting lenses, diagonal mirrors or Amici prisms provide you with an upright image. Diagonal mirrors provide an upright but back-to-front image and Amici prisms provide an upright and right-sided image.

Telescopes for experienced observers, but also for ambitious beginners.