Jerry S., 22 inch UC owner in Copperopolis, California - May 7, 2010
I had the Whirlpool in my sights tonight for the first time and it was a spectacular view. I'm looking forward to getting up to the Sierras after Memorial Day (passes are still closed!) so I can do as you suggested and see what a difference DARK makes!"
Jerry S.
Jürgen Breitung, 22" UC owner in Germany - May 22, 2010
Unfortunately the last days in Germany were cloudy, cold and rainy. But last night I had first light with the 22" Obsession UC in my backyard. Even with quarter moon and light pollution of nearby city Bad Kreuznach the 22" performed like a "starlight vacuum cleaner". M 13 was resolved into the core with 20mm Nagler but Hercules itself was hard to detect with naked eyes standing right over the city. In M97 the eyes were seen even under these conditions. I m looking forward for really dark skies. The scope is moving buttery easy and has an appearance more like a classic 18 incher. I have had an 16" self-made and 18" commercial Dobsonian with a couple of drawbacks but the overall mechanic execution of the Obsession 22" UC looks and feels more Mercedes or BMW like. Thanks Dave for this wonderful tool. Last night at 4:00 AM I finished my first session with a german Weizen Beer. Even my wife Ulrike says that this scope is the final choice for me and I agree.

Paul Johnson, 22" UC owner in Perth, Australia - August 13, 2010
G'day Dave, Last night I finally got my 22" Ultra Compact out to a dark site. I am happy to report that it fully lived up to all expectations - the optics, build quality, and electronics. Once the two star alignment was done, the telescope tracked accurately all night and it was able to find every object that I asked for.
Many of my old favorite objects look different through this new telescope due to the extra detail and the amazing number of stars coming into view around them. Globular clusters were resolved to the core as promised and I have never had planetary nebula's appear so bright in an eyepiece. I saw more galaxy's in the one night than I have ever seen before in my old scope - and averted vision was not needed.
Everyone in the group that I went out viewing with last night wanted to have a look to compare it with their view and they were all very impressed.
Thanks for producing such a high quality device. I am sure that this telescope will give me a lifetime of enjoyment.
Best regards, Paul Johnson
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 got now a new dimension. I can find soo many different targets in 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
| 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/4.5 Paracorr optional but not needed. |
| 3.5 secondary mirror. |
3.1 secondary mirror. |
| Coatings |
Same for both. 96% on primary, 98% on secondary |
| Mirror cell |
18 point |
9 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 11" 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 |