Ritchey-Chretien RC 300FC/Ti

There are basically two different types of telescope. A distinction is made between refractor (lens) and reflector (mirror) telescopes.

The aperture indicates the diameter of the objective lens or the mirror.

Is the ratio of the aperture to the focal length of a telescope.

Describes the brightness of a star or point-shaped object, which can still just be distinguished by the telescope. The naked eye, for example, can make out stars with a magnitude of up to 6.

The telescope’s magnification should not exceed this factor, because otherwise the image will appear weak and dark.

Here, the construction type means the geometric shape of the primary mirror.

The shadow effect of the telescope optics due to the secondary mirror, because this lies in the optical path.

There are basically two different construction types: the rack and pinion focuser and the Crayford focuser.

A Crayford focuser is a ball bearing guided friction drive and allows a very precise adjustment of the focus.