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Telescopes
22" f/4.2 UC (Ultra Compact)
- 22" UC Photos
- 22" UC vs 20" f/5 Classic
- 22" UC Specifications
- Mirror Options
- Standard Features and Accessories
- Optional Accessories
- Ordering Information
- Collapsed, the base is 28" x 29" x 18" high
- Weight of heaviest component is 90 pounds
- Eight truss poles instead of six
- Eyepiece height at zenith is 7 feet 4 inches
- See more Specifications
22" UC includes:
- Feathertouch focuser
- Telrad
- Wheelbarrow handles
- Counterweight kit
- External light baffle
- See more Standard Options
Read Tom Trusock's review of the 22" UC
22" f/4.2 UC $9,995
Plus Shipping & Crating
Orders received after August 1st price will be $10,995.
The NEW 22" f/4.2 UC (Ultra Compact) is a revolutionary design. It is a large aperture telescope that collapses into a very small package. If you have limited hauling or storage capacity, then this is the scope for you.
Our revolutionary Virtual Mirror Box (VMB) is the foundation of the UC design. It is a welded steel framework made from NC laser cut steel. It provides four main functions. It provides the primary mirror cell, the altitude bearings, the connection points for the truss poles, and a retainer for the wheelbarrow handles. To keep it as ultra compact as possible, the side bearing portion is foldable to reduce the height of the VMB by half.
trunk of Compact Chrysler Cirrus
John Nymark with his 22UC loaded in his 2012 Corvette
In the transport mode the clearance height is a mere 16 inches. Or place the VMB (Virtual Mirror Box) next to the rocker in your car and reduce the height even more. Now everyone can have a huge aperture scope and take it to their dark sky site. This telescope will appeal to those that like the ultimate in form follows function style. Lower eyepiece height means 80% of observing will be done with your feet on the ground. The UC is all black with a modern space frame construction. If you own a small vehicle, then the Ultra Compact is the obvious choice. And if you want big scope views and the ultimate in Dobsonian evolution, the Obsession Ultra Compact 22" is it.
No compromises. The UC uses the same proven design criteria and materials that made the Classic Obsession so successful and the most copied larger aperture dob on the market. We use the same premium optics from Galaxy and OMI that we do in our Classic series of telescopes. Diffraction limited and all figured and tested with interferometry. Ion deposition 96% enhance primary coating. Two inch flex free glass. One tenth wave 98% Diamond brite secondary mirror. As with our Classic series, you cannot get better optics at any price anywhere. Galaxy and OMI are so confident of their quality that they post the serial number and test data for every mirror they make on their web sites for everyone to review. Nobody else does this.
| 7.5 times the light gathering power of an 8 inch Schmidt-Cassegrain | Obsession 22" UC |
Typical 8" |
|---|---|---|
| Limiting stellar magnitude: | 16.7 | 14.0 |
| Rayleigh Resolution Limit: | 0.25 arc seconds |
0.68 arc seconds |
| Contrast limit: (minimum diameter before a nebular object fades from view) |
4.0 arc minutes |
11.0 arc minutes |
22" UC Photos
See more photos from 22" UC owners
22" UC vs 20" f/5 Classic |
||
Obsession 22" UC |
Obsession 20" f/5 Classic |
|
| Eyepiece height at zenith | 88 inches | 96 inches |
| Set up time including nylon light shroud | Same for both | |
| Ease of use (setup, take down, collimation) | Same for both | |
| Ease of Motions (hand guiding) | Same for both | |
| Construction/materials | Same for both, except: | |
| components covered with satin black laminate | components are stained and have six coat polyurethane finish | |
| Bearing geometry and surfaces | Same for both, Ebony star on etched virgin Teflon | |
| Light baffling | Classic is better with 360 degree upper tube assembly baffle. UC 160 degree baffle opposite focuser. Views and contrast are identical unless there is a nearby street light in the area. If you only observe in the city at home then the Classic is the better choice. If you like to take your scope to a dark site the UC is an excellent choice, especially if you drive a sedan or have limited transport space. | |
| Optics (OMI) (Galaxy does not offer anything under 18 inches) | f/4.2 primary mirror requires a Paracorr coma corrector for optimum views. | f/5 Paracorr not needed |
| 3.5" secondary mirror. | f/5 - 3.1" secondary mirror | |
| Coatings | Same for both. 96% on primary, 98% on secondary | |
| Mirror cell | 18 point | 22 point |
| Wheelbarrow handles | Standard on both | |
| Truss poles | Eight 1.25 inch diameter. Connected in pairs at apices. | Eight 1.25 inch diameter. All eight separate. |
| Stability | UC has 8 pole design and Baltic Birch steel reinforced segmented bearings. Much less mass than Classic. | Eight pole design and one piece cast aluminum side bearings. Mirror box and rocker have more mass. Total weight is about 50 pounds (compared to a 20" Classic) heavier than the UC. Classic is a better choice for CCD imaging. |
| Dimensions for transport | 28" x 29" x 13" high. Virtual mirror box alone (this is the smallest way to transport). 28" x 29" x 16" high. Includes virtual mirror box nested in rocker (will fit in most trunks or hatchback). |
29" x 29" x 31" high (rocker and mirror box) Upper tube assembly placed next to lower unit. |
| Upper Tube Assembly weight (with Feathertouch focuser) | 8 pounds | 11 pounds |
| Weight of heaviest component (includes 2 inch thick standard thickness mirror) | 90 pounds. Includes the virtual mirror box, mirror, and dust cover | 82 pounds Includes mirror box, mirror, and dust cover. |
| Weight at wheelbarrow handles | about 22 pounds | about 25 pounds |
| Weight of complete scope | about 150 pounds | about 150 pounds |
| Clearance width required with wheelbarrow handles attached. (or minimum size of doorway needed to roll in or out with wheels attached) |
34 inches Clearance width needed when carrying UC virtual mirror box is 28 inches. |
33 inches |
22" UC Specifications:
Metric info shown in italics
Primary Mirror:
- 22" - 559 mm GALAXY, or OMI 2 inch thick mirror
- 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:
- 3.5" - 89 mm United Lens 1/10 wave or better
- Interferogram included
- 98% reflectivity at 550 nm
- Super enhanced Brilliant-Diamond non-fading multi-dielectric coating
see Optics page for more info
Focal Length:
- 92" (± 2") - 2337 mm (± 50 mm)
Eyepiece Height at Zenith:
- (approximately) 7'4" - 224 cm
Mirror Cell:
- 18-point
Truss Pole:
- Length: 70" (± 2") - 178 cm (± 5 cm)
- Diameter: 1.25" - 32 mm
- Wall Thickness: 0.035" - 0.9 mm
Upper Assembly:
- Diameter: 27" - 69 cm
- Height: 11" - 28 cm
- Weight: 8 lbs. - 3.6 kg
Lower Assembly:
- Virtual Mirror Box alone folded for Transport
28" x 29" x 13" high - Virtual Mirror Box stacked in Rocker for Transport
28" x 29" x 16" high
Mirror Options:
Obsessions are built with premium diffraction limited optics from Galaxy and OMI (Optical Mechanics Inc.). See Optics page for more info.
Choose from Galaxy or OMI mirrors when ordering.
Interferometry certification included on all mirrors, both primary and secondary. Ion deposition 96% enhanced coatings standard on all mirrors.
Standard Features and Accessories:
Feathertouch focuser by Starlight Instruments
Standard on all Ultra Compacts
Low profile, Crawford type, 2 inch focuser, with 1-1/4 inch threaded adaptor for filters. Compression rings. Can be swiveled on it's base to the most convenient position. A joy to use and beautiful to look at.
Telrad
Standard on all Ultra Compacts
External light baffle
Standard on all Ultra Compacts
Counterweight kit
Standard on all Ultra Compacts
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 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
Paracorr
$450 (Highly recommended at f/4.2)
Ripstop Nylon light shroud
(Highly recommended)
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
ServoCAT Goto Drive System
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.
Ordering Information:
A Deposit is required to place an order ($2,200 for 22" UC)
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.
Customer Comments
Paul Koller,
22" UC owner in southern Austria
August 26, 2010
Dave, let me thank You for making this absolutely portable big scope. It is really impressive and gives soooo bright views! This is it, I was always dreaming of!! It will last many, many nights to look for all the possible objects I can reach with this giant. As a guide for the future I got now THE NIGHT SKY OBSERVER'S GUIDE Vol 1, 2, 3 (William Bell Inc., USA) so the potential of the instrument is necessary to find all the listed objects.
With the help of ServoCat GoTo and the ArgoNavis DSC it's really fun to jump from one object to the next. For me, visual observing has now got a new dimension. I can find so many different targets in a short time, there is no problem to make public viewing and tracking of objects gives the easy possibility to use high magnifications.
Greetings from one that is now really obsessed !
Paul Koller (:o)))
"Emberger Alm" in southern Austria
Read more 22" UC customer comments
Hohe Dirn - Deep Sky Nacht
YouTube video (slide-show) of Paul Koller and Justin Kabaus of Austria with a pair of 22 UCs at Hohe Dirn mountain.