Equipment
焦距
Focal length
Distance from objective to focus.
Longer focal length means a narrower field.
Related terms
- Dobsonian — A large reflector on a simple alt-az rocker box.
- GoTo mount — A mount that slews to a target and tracks it.
- Tripod — The base holding a telescope or camera.
- Binoculars — Two short scopes side by side: wide field, easy to aim.