           
Dan Price took this incredible image of M56 with an Obsession 25 f/5, Galaxy Mirror, Stellarcat ServoCAT, Argo-Navis DSC, Optec Pyxis Field De-Rotator, SBIG ST-10XME, SBIG AO-7, and Optec TCFS. Three one minute exposures in red, green and blue. Notice that the core is not "burned out" like so many photos. Outstanding core resolution and peripheral stars all exposed perfectly.
Dan Price took this incredible image of M13 with an Obsession 25 f/5, Galaxy Mirror, Stellarcat ServoCAT, Argo-Navis DSC, Optec Pyxis Field De-Rotator, SBIG ST-10XME, SBIG AO-7, and Optec TCFS. Incredible detail similar to what professional observatories are doing.
Bob Brunck with his 25" Obsession.
Dave Laroche with his 25" at The Black Forest Star Party in 2005
John H. with his 25"Obsession and ServoCAT GOTO drive in his English garden. Notice English observers like to observe with the eyepiece on the opposite side compared to North American observers. Is this because they drive on the opposite of the street?
John H. with his 25"" in Monteray California
Mike Sperry ready for First Light with his new 25".
John Sefick at the focuser of the 25" Obsession telescope at Chaco Canyon Culture Historical Park in New Mexico. Operated in cooperation with the National Park Service, the Night Sky Program at Chaco Canyon provides a large menu of astronomy activities to over 14000 visitors a year.
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Free Obsession DVD product Video
To obtain a hard copy of Obsession literature including our 120 minute product video, e-mail your POSTAL address, or fill out this form and we'll mail it to you at no charge (World-wide).
The video is great for determining which aperture is best for you.
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Home > Telescopes > 25" Obsession
You won't believe your eyes.
This is the cure for aperture fever!
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Orders received after May 1st - price will be $12,295.
Forget averted vision. Globulars, nebulae, and galaxies will come screaming out of the eyepiece.
Join the realm of Herschel whose famous NGC catalog of deep sky object descriptions are exactly what you will experience.
This is the telescope that Dave Kriege, founder of Obsession, uses for his personal observing.
The Obsession 25 is considered to be the ultimate telescope for the serious deep sky astronomer who can afford the best.
One person set up, one handed guiding, one incredible observing machine.
Try direct vision - you'll get used to it.
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25" f/5 vs 25" f/4:
The 25" Obsession can be ordered as an f/5 (125" 3175 mm focal length)
or as an f/4 (100" 2540 mm focal length).
Eyepiece height at zenith for 25" f/5 is 10 feet.
Eyepiece height at zenith for 25" f/4 is 8 feet.
Advantages of f/5
- Crisper images, no Paracor coma corrector needed. Coma is inversely proportional to the cube of the focal ratio. In other words, the coma free field of view in a f/5 is twice as big as in an f/4.
- Easier to achieve precise collimation of primary mirror.
- Cost is less than an f/4.
- Slightly smaller 3.5" central obstruction (4" on f/4)
Advantages of f/4
- Smaller ladder, two steps shorter than an f/5.
- Easier to use for public viewing.
- Rich field of view. Great for star cruising the Milky Way and large deep sky objects. Easier to keep object in field of view.
In short, both scopes provide dramatic and exciting views. The f/5 is the ultimate personal scope. It yields better coma free images, but requires two more ladder steps. The f/4 is easier for public viewing, but requires a coma corrector like the Paracor.
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M57, the Ring Nebulae in Lyra taken by Bob Brunck with 25" Obsession at prime focus with Canon digial camera.
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NGC 891 taken by Bob Brunck with 25 inch Obsession, Equatorial Platform, and Canon EOS digital camera. Note the incredible detail within the dust lane
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Cats Eye Nebulae (NGC 6543) in Draco taken by Bob Brunck with 25" Obsession at prime focus with Canon digital camera.
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| see more 25" user photos |
Mirror Options:
see the Optics page for more info
Obsessions are built with premium diffraction limited optics from Galaxy and OMI (Optical Mechanics Inc.).
Choose from Galaxy or OMI mirrors when ordering 25" f/5.
Only OMI Torus supplies mirrors for our 25" f/4.
Obsessions are also available without optics if you already have your mirrors. Call, fax, or email for price and delivery.
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Standard Options and Accessories
- Choose from four great focusers
The JMI EV3 comes standard on all Obsessions. Or upgrade to the EV1, or EV1 with motofocus, or the awesome Feathertouch by Starlight Instruments. See the Focuser Options page for more focuser options
- Wheel Barrow handles
Comes standard on all Obsessions 15" through 30" at no extra charge.
They're not necessary on the 12.5".
- Primary Mirror Coating
Enhanced Aluminum - 96% reflectivity, with dielectric overcoat (a supreme coating) standard on all primary mirrors.
- Secondary Mirror Coating
An Obsession exclusive - Super enhanced Brilliant-Diamond is standard on all Obsession secondary mirrors. This premium multi-dielectric coating has 98% reflectivity at 550 nm. The ultimate coating for the deep sky obsessed. This coating is standard on all Obsession secondaries at no extra charge. Brilliant-Diamond is just one of the reasons Obsessions out perform all others.
With 96% enhanced on the primary and our standard 98% Brilliant Diamond secondary, the optical system is equivalent to an extra 2" of aperture!
Optional Accessories:
See the Accessories page for more info on these items
- Telrad
- Ripstop Nylon light shroud.
- Barlow-Laser Collimator 2" barrel. Highly recommended. Includes 2" magnetic barlow lens and mask for the new barlowed laser collimating technique. Great visual aid and no better way to accurately align fast Newtonians. learn how
- Argo Navis digital setting circles with super res 10K encoders. more info
- ServoCAT Goto Drive System. more info
- Counterweight kit - (you supply the lead shot or sand) Recommended if you intend to use heavy barlow/eyepiece combinations, a Paracorr coma corrector, a traditional finderscope, or the Argo Navis digital setting circles.
- Dew heater for secondary mirror - Secondary mirror heating system automatically senses the air temperature and the mirror temperature, then maintains the secondary at a preset (adjustable) temperature above the ambient air temperature to prevent dewing or icing. more info
Ordering Information:
A Deposit is required to place an order ($3,500 for 25").
Mail the deposit to:
Obsession Telescopes
PO Box 804
Lake Mills, WI 53551
USA
You can e-mail your order, or mail it with the deposit.
- With your order, please list any options and/or accessories you want, your mailing address, e-mail address if any, and phone number(s).
- After we receive it, we will send you an order confirmation letter.
- Delivery is usually 1 to 2 months from time of order.
- Please e-mail for current delivery times.
- Balance due prior to shipment.
- Prices do not include shipping and crating. We ship throughout the world via UPS.
- Any questions, please call or e-mail.
- NOTE 10% order cancelation charge.
Need more information?
E-mail your postal address and we'll send you the Obsession brochure and video at no charge.
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