Apochromatic refractor AP 102/684 ED OTA

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

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.

The weight of the tube is critical for the correct choice of mount.

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.

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.