Thinking About a New Scope? Think Big!
Comparisons |
Typical 8" |
12.5" |
15" |
18" |
20" |
22" |
25" |
|---|---|---|---|---|---|---|---|
| Light gathering power over typical 8" Schmidt-Cassegrain | - | 2.5X | 4X | 5X | 6X | 7.6X | 10X |
| Limiting stellar magnitude: | 14.0 | 15.0 | 15.5 | 16.0 | 16.5 | 16.7 | 17 |
| Rayleigh Resolution Limit: | 0.68 arc seconds |
0.38 arc seconds |
0.36 arc seconds |
0.31 arc seconds |
0.27 arc seconds |
0.25 arc seconds |
0.22 arc seconds |
| Contrast Limit: (minimum diameter before a nebular object fades from view) |
11 arc minutes |
6.0 arc minutes |
5.7 arc minutes |
4.8 arc minutes |
4.3 arc minutes |
4.0 arc minutes |
3.4 arc minutes |
