Obsession 18" classic for sale

Obsession telescoop webObsession telescope

Original Obsession Classic 18" F/4.5 with Servocat track and goto system and Argo Navis navigation computer. Completely automated goto and tracking system. Total new price for this system is $ 10,036.

When disassembled the telescope can easily fit in a SUV or pick-up truck for transport to a dark site; the cage with the secondary mirror is placed in a custom made box for storage and transport. Setting up the telescope, collimation and initial alignment can be done in about 15 minutes.

A Dobsonian telescope is primarily a telescope for visual use. Taking pictures is possible and done; it is depending on the weather conditions; in Curaçao there is always a rather strong wind which makes it almost impossible to work with longer exposture times. Imaging the planets and the moon can easily be done by making a movie and stack the best frames. Deep Sky Objects is not possible in Curaçao because of the wind, but I have seen images taken with this kind of telescop from other countries that are quite good. Very long exposures cannot be used because of the alt-azimuth drive system.


The following accessories are included in this sale:

  • Eyepieces
    • Televue Nagler type 5 31 mm 2", apparent FOV 82 degrees
    • Televue Nagler type 4 22 mm 2", apparent FOV 82 degrees
    • Televue Radian 8 mm 1.25" with 2" adapter, apparent FOV 60 degrees
    • Televue Big Barlow 2x 2" with 1.25" adapter doubles all the eyepieces
    • Televue Paracorr coma corrector 2" with 1.25" adapter
  • Other accessories:
    • Hotech SCA-2C Laser Collimator
    • 2" Televue focuser to T-ring adapter to connect photo camera
    • Filter slide with 3 2" filters:
      • Lumicon Deep Sky
      • Lumicon UHC
      • Lumicon O III
    • Telrad to point the telescope during alignment and to move manually to an object
    • Power cable to connect the power ground board of the telescope to a 12V battery
    • CATtail DSC stalk for the Argo Navis and Stellarcat wireless or wired adapter
    • Extra stalk to put a laptop computer on if needed

Total new price of all the eyepieces is $ 2,072; total new price of the other accessories is $ 1,094.

Sales price

Everything is in used but good condition. The primary mirror could use a cleaning but that is not necessary especially when used under light polluted skies. Under pristine skies cleaning could make a difference. Cleaning has be done once and is easy; instructions are available. Cleaning can be done with the mirror inside the telescope.

The new price of telescope, eyepieces and accessories is $ 13,202; the asking price is just $ 5,600 (41% of the new price).

Everything has to go in one sale; "as is where is" in Curaçao. Shipping and handling to another country will be extra.

Pictures of all the components

Some pictures taken with this telescope