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| Specifications for all Obsession Telescopes | |||||||||
| Click here for English values |
12.5" | 15" | 15" UC | 18" | 18" UC | 20" | 25" | 25" | 30" |
| Focal Ratio: | f/5 | f/4.5 | f/4.2 | f/4.5 | f/4.2 | f/5 | f/5 | f/4 | f/4.5 |
| Focal Length: | 1590 mm (± 50 mm) |
1727 mm (± 50 mm) |
1600 mm (± 50 mm) |
2060 mm (± 50 mm) |
1905 mm (± 50 mm) |
2540 mm (± 50 mm) |
3175 mm (± 50 mm) |
2540 mm (± 50 mm) |
3430 mm (± 50 mm) |
| Primary Mirror: | 317 mm OMI 50.8 mm thick |
381 mm OMI 50.8 mm thick |
381 mm OMI 50.8 mm thick |
457 mm GALAXY, or OMI 50.8 mm thick |
457 mm GALAXY, or OMI 50.8 mm thick |
508 mm GALAXY, or OMI 50.8 mm thick |
635 mm f/5: GALAXY, or OMI 50.8 mm thick |
635 mm f/4: OMI 50.8 mm thick |
762 mm OMI 50.8 mm thick |
| Secondary Mirror: | 54 mm United Lens |
66 mm United Lens |
66 mm United Lens |
79 mm United Lens |
79 mm United Lens |
79 mm United Lens |
89 mm United Lens |
102 mm United Lens |
114 mm United Lens |
| Mirror Cell: | 9-point | 9-point | 9-point | 18-point | 18-point | 18-point | 18-point | 18-point | 27-point |
| Truss Pole: | Length: 104 cm (± 5 cm) Diameter: 25 mm Wall Thickness: 0.9 mm |
Length: 114 cm (± 5 cm) Diameter: 32 mm Wall Thickness: 0.9 mm |
Length: 122 cm (± 5 cm) Diameter: 25 mm Wall Thickness: 0.9 mm |
Length: 140 cm (± 5 cm) Diameter: 32 mm Wall Thickness: 0.9 mm |
Length: 140 cm (± 5 cm) Diameter: 32 mm Wall Thickness: 0.9 mm |
Length: 180 cm (± 5 cm) Diameter: 32 mm Wall Thickness: 0.9 mm |
Length: 220 cm (± 5 cm) Diameter: 38 mm Wall Thickness: 1.2 mm |
Length: 180 cm (± 5 cm) Diameter: 38 mm Wall Thickness: 1.2 mm |
Length: 225 cm (± 5 cm) Diameter: 38 mm Wall Thickness: 1.6 mm |
| Upper Assembly: | Diameter:
41 cm Height: 25 cm Weight: 2.5 kg |
Diameter:
48 cm Height: 25 cm Weight: 3.6 kg |
Diameter: 48 cm Height: 25 cm Weight: 2.7 kg |
Diameter:
56 cm Height: 30 cm Weight: 4.1 kg |
Diameter:
56 cm Height: 34 cm Weight: 2.7 kg |
Diameter:
63 cm Height: 33 cm Weight: 5 kg |
Diameter:
76 cm Height: 40.5 cm Weight: 6.8 kg |
Diameter:
76 cm Height: 40.5 cm Weight: 7.2 kg |
Diameter:
92 cm Height: 48 cm Weight: 9 kg |
| Lower Assembly: (see diagram) |
A= 61 cm B= 43 cm C= 38 cm D= 48 cm |
A= 63 cm B= 58 cm C= 48 cm D= 53 cm |
Virtual Mirror Box alone folded for transport 610 cm x 610 cm by 280 cm high Virtual Mirror Box stacked in Rocker for Transport 610 cm x 610 cm x 318 cm high |
A= 66 cm B= 68 cm C= 53 cm D= 63 cm |
Virtual Mirror Box alone folded for transport 56 cm x 64 cm by 30 cm high Virtual Mirror Box stacked in Rocker for Transport 64 cm x 64 cm x 34 cm high |
A= 79 cm B= 73 cm C= 63 cm D= 68 cm |
A= 89 cm B= 89 cm C= 71 cm D= 81 cm |
A= 89 cm B= 89 cm C= 71 cm D= 81 cm |
A= 110 cm B= 105 cm C= 82 cm D= 97 cm |
| Mirror Box Weight: (what you don't lift) |
18 kg | 27 kg | N/A | 36 kg | N/A | 46 kg | 68 kg | 68 kg | 96 kg |
| Weight at Handles: (what you do lift at Wheelbarrow handles) |
No handles required |
4 kg | 3.5 kg | 8 kg | 4.5 kg | 11 kg | 18 kg | 18 kg | 28 kg |
| Eyepiece Height at Zenith: |
(approx.) 152 cm |
(approx.) 167 cm |
(approx.) 155 cm |
(approx.) 198 cm |
(approx.) 178 cm |
(approx.) 245 cm |
(approx.) 305 cm |
(approx.) 245 cm |
(approx.) 335 cm |
| Limiting stellar magnitude: |
15 | 15.5 | 15.5 | 16 | 16 | 16.5 | 17 | 17 | 17.5 |
| 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 |
0.22 arc seconds |
0.22 arc seconds |
0.20 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 |
3.4 arc minutes |
3.4 arc minutes |
2.9 arc minutes |
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