Tools
Telescope math
Magnification is focal length divided by eyepiece. More is not better — a tiny, grey, shaky disc is a wasted night. Aim for an exit pupil between about 0.8 and 7 mm.
- Magnification
- 36×
- Focal ratio
- f/10.0
- Exit pupil
- 2.5 mm
- True field
- 1.39°
- Useful range
- 13–180×
- Dawes limit
- 1.29″