Thinking About a New Scope? Think Big!


Made in the USA


15" f/4.5 Classic

15" Classic Obsession

Frederic R. of Voisins le Bretonneux France

M13 comparison


15" f/4$7,495

Plus Shipping & Crating

Medium Aperture, keep your feet on the ground!

Now everyone can own a piece of the dream.

The Obsession 15 has the same quality and award winning design as our other telescopes at a really great price.

Four times the light gathering power of an 8 inch scope so you get much bigger and brighter images.

With an Obsession 15 you can really see the universe.

Easy to set up and use, the eyepiece height is always less than 5 1/2 feet off the ground. Most observers won't even need to use a ladder!

Wheelbarrow handles included at no extra charge.

4 times the light gathering power of an 8 inch Schmidt-Cassegrain Obsession
Limiting stellar magnitude: 15.5 14.0
Rayleigh Resolution Limit: 0.36
arc seconds
arc seconds
Contrast limit:
(minimum diameter before a
nebular object fades from view)
arc minutes
arc minutes

Customer Comments

Mike B., 15" owner in Vancouver, Washington - June 3, 2016

Ted Forte

I am now into the second year since I purchased my 15” Classic Obsession. In a nut shell it was the best decision I have made since I jumped head first into astronomy 2 years ago. I just returned from our astronomy’s star party where the views the scope was providing were amazing. I was inviting fellow members to share my eye piece throughout the evening. One of our members, as seasoned veteran of 18 years, was so impressed by the views of M51, the Veil Nebula, Bode’s Nebula, the Sombrero Galaxy, etc. that she was considering purchasing one. For me, the 15” Classic has hit the sweet spot between portability and aperture. I am one happy amateur astronomer.

Ron O., 15" owner in Erie, Pennsylvania

Hello Dave: Thank you for a magnificent instrument. My first night out was fantastic. I never knew what detail could be captured in a quality 15" system vs. my old 8" LX200. I am permanently hooked on my Obsession. Folks who were with me felt that the optics on my 15 were superior to other 18's on site.

John A. 15" owner in Surrey England

Suffice to say, on the occasions when I have managed to coincide with reasonable viewing I have been gobsmacked by what I can see. I remember thinking after my first sight of M13, "I can now die a happy man" - mindblowing! Thanks again for a wonderful telescope all the best!

Read more 15" customer comments


M108 CCD image by Doug Askew

Helix Nebulae

Helix Nebulae by Pierre Schmidt and Eduard von Bergen in Austria

NGC 2903

NGC 2903 CCD image by Doug Askew


M27, the Dumbell Nebulae in Vulpecula by Pierre Schmidt and Eduard von Bergenin in Austria


M51 CCD image by Doug Askew

Abell 1367

Abell 1367 CCD image by Doug Askew


M13 CCD image by Doug Askew


M27 CCD image by Doug Askew

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15" Specifications:

Metric info shown in italics

Primary Mirror:

  • 15" - 381 mm OMI 2 inch thick mirror
  • Fused silica glass standard on all 15" Classic primary mirrors.
  • 96% reflectivity
  • Enhanced Aluminum Coating and Dielectric Overcoat (a supreme coating)
  • Center marked for precise collimation
  • plus Interferometry certification

see Optics page for more info

Secondary Mirror:

  • Pre-installed
  • 2.6" - 66 mm United Lens 1/10 wave or better
  • Interferogram included
  • 96% reflectivity at 550 nm
  • Super enhanced Brilliant-Diamond non-fading multi-dielectric coating

see Optics page for more info

Focal Length:

  • 68" (± 2") - 1727 mm (± 50 mm)

Eyepiece Height at Zenith:

  • (approximately) 66" - 167 cm

Mirror Cell:

  • 9-point

Truss Pole:

  • Length: 45" (± 2") - 114 cm (± 5 cm)
  • Diameter: 1.25" - 32 mm
  • Wall Thickness: 0.035" - 0.9 mm

Upper Assembly:

  • Diameter: 19" - 48 cm
  • Height: 10" - 25 cm
  • Weight: 8 lbs. - 3.6 kg

Lower Assembly:

  • A= 25" - 63 cm | B= 23" - 58 cm | C= 19" - 48 cm | D= 21" - 53 cm

see diagram

Mirror Box weight:

  • The heaviest component (what you don't lift): 60 lbs - 27 kg
  • Weight at Handles: (what you lift at Wheelbarrow handles): 9 lbs - 4 kg

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Standard Features and Accessories:

Choose from four great focusers

The JMI EV3 comes standard on all Classic Obsessions. Or upgrade to the EV1, or EV1 with motofocus, or the awesome Feathertouch by Starlight Instruments. See the Focuser Options page for more information.


JMI EV3 (standard on all Classics)

JMI EV1 with motofocus

JMI EV1 with motofocus



Feathertouch by Starlight Instruments

by Starlight Instruments

Wheelbarrow handles

Comes standard on all Obsessions 12.5" through 25" at no extra charge.

Primary Mirror Coating

Enhanced Aluminum - 96% reflectivity, with dielectric overcoat (a supreme coating) standard on all primary mirrors. See Optics page for more info.

Secondary Mirror Coating

An Obsession exclusive - Super enhanced Brilliant-Diamond is standard on all Obsession secondary mirrors. This premium multi-dielectric coating has 96% 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 96% Brilliant Diamond secondary, the optical system is equivalent to an extra 2" of aperture!

12 volt cooling fan

telescope mirror cooling fan

12 volt cooling fan comes standard on all Classic and Ultra Compact scopes.

Fused quartz

15” Obsessions use fused quartz for the primary mirror glass.

more info

Optional Accessories:

See the Accessories page for more info on these items

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.


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 ultra res 32K encoders

more info

ServoCAT Goto Drive System

more info

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.

Pre-installed (if ordered).

more info

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Ordering Information:

A Deposit is required to place an order ($1,600 for 15" Classic)

Mail the deposit to:

Obsession Telescopes
PO Box 804
Lake Mills, WI 53551

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.