APM offers you a comprehensive selection of different telescopes for every requirement and budget. We can offer you various mirror telescopes, refractors and catadioptric telescopes, from a simple entry-level telescope to a 1.5m observatory telescope.
ONTC Newtonian Telescopes from Teleskop Service are a unique system on the marketYou choose the components and the bias of your telescope and get a Newtonian without compromises for reaching your astronomical goals
The William Optics GT 81 apo stands for optimal chromatic correction and best possible contrast - a powerful travel telescope for observation and photography.
Aperture 81 mm
Focal length 480 mm
Focal ratio f/5.9
Multicoated FPL53 triplet lens with air gap
2.5" RAP focuser with M63x1 connection thread, as well as 2" and 1.25
William offers with the REDCAT61 Astrograph a very well corrected telescope for astrophotography up to full frame format.
Aperture 61 mm / Focal length 300 mm / Focal ratio f/4.9
Petzval design with chromatic aberration free FPL53 objective (4 elements in 3 groups)
Very well corrected and illuminated image field up to full frame format - the corrector is built in - no more adapter battle necessary
Camera connection via M48 male thread (suitable adapters are available) - working distance 55 mm
360° rotation of the camera for the right display window
Focusing via internal focusing (William Internal Focus Design - WIFD) as with telephoto lenses
Tilting option for individual adjustment of the camera sensor to the telescope
Flexible dovetail bar at the base (long version), suitable for Vixen style and Arca-Swiss saddle plates, in addition with 1/4" female photo tripod thread
Nylon carrying bag and Bahtinov mask for astrophotography are included in delivery