The main telescope of the Hans Haffner Observatory is the Astrograph CDK 20 from PlaneWave-Instruments with a primary mirror diameter of 50 centimeters. The telescope is carried by a GM 4000 HPS II mount of 10 microns and is complemented by the apochromatic lens telescope ED 120 from Sky-Watcher with an aperture of 12 centimeters.
In contrast to microscopy, magnification is not as important for the telescope. Instead, the light collecting surface of a telescope is usually of greater scientific importance because many astronomical objects appear extremely faint when observed from Earth. The larger the diameter of the mirror or lens, the brighter the astronomical object appears and the more details can be seen.
For example, the CDK 20 has a light collecting surface that is about ten thousand times larger than the human pupil.An astrograph is a telescope that is optimized for astrophotography. It produces the largest possible, flawless and flat image, so that the flat camera chip is illuminated as evenly and distortion-free as possible up to the edge.