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| Specifications for all Obsession Telescopes | |||||||||
| Click here for Metric values |
12.5" | 15" | 15" UC | 18" | 18" UC | 20" | 20" | 25" | 25" |
| Focal Ratio: | f/5 | f/4.5 | f/4.2 | f/4.5 | f/4.2 | f/5 | f/4 | f/5 | f/4 |
| Focal Length: | 63" (± 2") | 68" (± 2") | 63" (± 2") | 81" (± 2") | 75" (± 2") | 100" (± 2") | 80" (± 2") | 125" (± 2") | 100" (± 2") |
| Primary Mirror: | 12.5" OMI 2" thick mirror |
15" OMI 2" thick mirror |
15" OMI 2" thick mirror |
18" GALAXY, or OMI 2" thick mirror |
18" GALAXY, or OMI 2" thick mirror |
20" GALAXY, or OMI 2" thick mirror |
20" GALAXY, or OMI 2" thick mirror |
25" f/5: GALAXY, or OMI 2" thick mirror |
25" f/4: OMI 2" thick mirror |
| Secondary Mirror: | 2.14" United Lens |
2.6" United Lens |
2.6" United Lens |
3.1" United Lens |
3.1" United Lens |
3.1" United Lens |
3.5" United Lens |
3.5" United Lens |
4.0" United Lens |
| Mirror Cell: | 9-point | 9-point | 9-point | 18-point | 18-point | 18-point | 18-point | 18-point | 18-point |
| Truss Poles: | Length: 41" (± 2") Diameter: 1.00" Wall Thickness: 0.035" |
Length: 45" (± 2") Diameter: 1.25" Wall Thickness: 0.035" |
Length: 48" (± 2") Diameter: 1" Wall Thickness: 0.035" |
Length: 55" (± 2") Diameter: 1.25" Wall Thickness: 0.035" |
Length: 55" (± 2") Diameter: 1.25" Wall Thickness: 0.035" |
Length: 70" (± 2") Diameter: 1.25" Wall Thickness: 0.035" |
Length: 55" (± 2") Diameter: 1.25" Wall Thickness: 0.035" |
Length: 87" (± 2") Diameter: 1.5" Wall Thickness: 0.049" |
Length: 70" (± 2") Diameter: 1.5" Wall Thickness: 0.049" |
| Upper Assembly: | Diameter: 16" Height: 10" Weight: 5 lbs. |
Diameter: 19" Height: 10" Weight: 8 lbs. |
Diameter: 19" Height: 10" Weight: 6 lbs. |
Diameter: 22" Height: 12" Weight: 9 lbs. |
Diameter: 22" Height: 13.5" Weight: 6 lbs. |
Diameter: 25" Height: 13" Weight: 11 lbs. |
Diameter: 25" Height: 13" Weight: 11 lbs. |
Diameter: 30" Height: 16" Weight: 15 lbs. |
Diameter: 30" Height: 16" Weight: 16 lbs. |
| Lower Assembly: (see diagram) |
A= 24" B= 17" C= 15" D= 19" |
A= 25" B= 23" C= 19" D= 21" |
Virtual Mirror Box alone folded for Transport 24" x 24" by 11" high Virtual Mirror Box stacked in Rocker for Transport 24" x 24" x 12.5" high |
A= 26" B= 27" C= 21" D= 25" |
Virtual Mirror Box alone folded for transport 22" x 25" by 12" high Virtual Mirror Box stacked in Rocker for Transport 25" x 25" x 13.5" high |
A= 31" B= 29" C= 25" D= 27" |
A= 31" B= 29" C= 25" D= 27" |
A= 35" B= 35" C= 28" D= 32" |
A= 35" B= 35" C= 28" D= 32" |
| Lower Assembly width with wheelbarrow handles attached: | 25" | 27" | 25" | 31" | 28" | 33" | 33" | 38" | 38" |
| Mirror Box Weight: (what you don't lift) |
39 lbs. | 60 lbs. | N/A | 80 lbs. | N/A | 100 lbs. | 100 lbs. | 150 lbs. | 150 lbs. |
| Weight at Handles: (what you do lift at Wheelbarrow handles) |
6 lbs Handles are optional on 12.5" |
9 lbs. | 8 lbs. | 18 lbs. | 10 lbs. | 25 lbs. | 25 lbs. | 40 lbs. | 40 lbs. |
| Eyepiece Height at Zenith: |
(approx.) 5' |
(approx.) 5' 6" |
(approx.) 5' 1" |
(approx.) 6' 5" |
(approx.) 5' 10" |
(approx.) 8' |
(approx.) 6' 6" |
(approx.) 10' |
(approx.) 8' |
| Limiting stellar magnitude: |
15 | 15.5 | 15.5 | 16 | 16 | 16.5 | 16.5 | 17 | 17 |
| Rayleigh Resolution Limit: |
0.38 arc seconds |
0.36 arc seconds |
0.36 arc seconds |
0.31 arc seconds |
0.31 arc seconds |
0.27 arc seconds |
0.27 arc seconds |
0.22 arc seconds |
0.22 arc seconds |
| Contrast limit: (minimum diameter before a nebular object fades from view) |
6.0 arc minutes |
5.7 arc minutes |
5.7 arc minutes |
4.8 arc minutes |
4.8 arc minutes |
4.3 arc minutes |
4.3 arc minutes |
3.4 arc minutes |
3.4 arc minutes |
| Click here for Metric values |
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