Support Astromart! | Log In | Help
Astronomy NewsTelescope ClassifiedsTelescope AuctionsTelescope Articles & ArticlesTelescope Articles & ReviewsTelescope and Astronomy ForumsAstronomy Events Calendar
View Categories
Browse By Location
Place A New Ad
Display Preferences
Search Classifieds

User Name:


Save Login
New to Astromart?
Register an account...

Terms of Service
Privacy Policy
Help & FAQ
Astronomy Links
User Profiles
Top Users List
RSS Feeds

Home > Classifieds > Astromart Classifieds > Telescope - Catadioptric > Classified #132031

For Sale: APM custommade 10"F/8 Maksutov Newtonian with smallest C.O. and Carbonfiber Sandwich tube

Ad No.: 132031
Seller: APM-Telescopes
Posted: 7/6/2002 3:09 AM
Location: Goebenstrasse 35
Saarbruecken, - Germany
Phone: +49-174-3234333
Ad Hits: 761
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

Markus Ludes

Back to Listing

All times are in (GMT-8:00) Pacific Standard Time Zone  
Astronomy News | Telecope Classifieds | Telescope Auctions | Telescope Reviews | Telescopes | Telescope and Astronomy Forums | My Account | Help | RSS