We manufactoring 2 pc custommade Maksutov Newtonian Telescopes, 1 is sold, second is now for sale to anybody.
The Idea on this custommade telescopes is ultralightweight and smallest possible central obstruction for highest performance/contrast Planetary Observers.
So we decited to go with a 10" ( 254 mm ) F/8 ( 2,000 mm ) optical design, using a 32 mm small axis elliptical secondary mirror which produce a central Obstruction of only 12.6 %, which is already such small, that its hard or maybe impossible to see a diffrence against same size high quality apochromat. The Field of view is of course narrow and for CCD work also limited to smallest chips only.
Mirrors are made from Astrosital ( polished on back side) with a 96% reflection coating for the visual wavelenght range, meniscuslens is made from Russian BK 7, both side multicoated and optimised in transmission for visual wavelenghtes.
Tube is made ´from Carbonfiber sandwich design with an tubediameter of 300 mm and a tubelenght of 2,100 mm, tube is cremewhite overpainted on carbonfiber. Carbonfiber dew shield is about 300 mm long and baffled and attaches to the tube by an magentic connection.
Primary mirror cell is a 9 point alu floating cell, anadized with hand alignment screws , as much as possible open on rear to allow air to cool down the mirror quickly
Secondary holder comes with easy to collimate screws, is made from alu
Meniscuslens lens is easy to collimate , made from alu with air ventitalation holes
a cooling fan is attached at side of tube and at opposite are vented holes
Tuberotating system is includet which allows also move of tube forward or backwards for proper balansing
Focuser is a custommade APM-Ultralowprofilefocuser 2"
Asking price is uS $ 10,900, which is about 25 % of the price of same size Apo
serious inquirys are welcome