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Obsession 18 Classic - excellent condition Sold!

Price - $4,000.00

Ad Number: 183795

Posted: 18 Sep 2019

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This rarely used beauty became my backup telescope after I caught aperture fever and designed/built an f/3.7 22" Obsession clone in 2003. The 18 was purchased in 1998, but only used for 4 years. It has always been well cared for/stored in the Western US (AZ, CO, HI). I am the original owner. It has a very good center etched Nova mirror with Ronchi test certification included. Telescope comes with $500+ worth of parts/accessories including a first gen ArgoNavis computer (finiky in freezing conditions but otherwise fully functioning with latest firmware), 8K encoders (uninstalled), 9x60 finderscope, telrad, shroud, Astrosystems cover (some sun yellowing, but functional), a 1.25/2.0 adapted laser for collimation, and an older 50mm wide-field Plossl eyepiece. This telescope has only a few minor cosmetic use marks. New, this package would be worth $8500+ (including shipping). Coatings are original enhanced Alum, and mirrors have just been cleaned and look/perform great. Standard Obsession wheel-barrow handles for mirror/rocker box transport are included.

If desired, to achieve "push-to" computerized capability you would need to buy the encoder mount brackets & cables and finish the encoders/Argo install. Or, I can do the installation with 10K encoders, but the price would go up to $4800. Price is firm; 4K is my lowest acceptable bid. I've just done a complete disassembly, parts clean/tune-up. I've taken a good set of pics for all components, and reassembled to view the deep-sky. This f4.5 18" telescope is a buttery smooth, awesome performer (just as I remember, and as Obsession telescopes so proudly proclaims!). If you want to observe the deep sky with large aperture, but with feet mostly on the ground, this is the scope for you. Send a reply for questions or more pics/details. Will consider delivery for gas depending on distance; otherwise buyer pays shipping.


  • Condition excellent
  • Location Western Colorado

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