This form will help you determine the optimum diagonal size for your telescope. Where needed, fill in "user input" fields and click the [Calculate] button. The default values are from my 23.5" telescope. Values from other members telescopes are listed below.
|
Mirror Diameter (inches) |
13.10 |
14.80 |
23.50 |
|
Focal Ratio (f/#) |
4.50 |
5.57 |
4.50 |
|
Focal Length (inches) |
58.95 |
82.44 |
105.75 |
|
Focal Length (mm) |
1497.33 |
2093.87 |
2686.05 |
|
Focuser Height (inches) |
2.50 |
1.50 |
1.50 |
|
Tube Radius (inches) |
8.00 |
9.00 |
13.20 |
|
Secondary to Focal Point (inches) |
10.75 |
10.75 |
14.95 |
|
Secondary (inches) |
3.21 |
2.80 |
4.18 |
|
Aperature (sq inches) |
134.78 |
172.03 |
433.74 |
|
size of moon |
0.53 |
0.74 |
0.95 |
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This web page was last updated 09/08/18