Equipment
天顶镜
Star diagonal
The 90° eyepiece adapter on a refractor.
It puts the eyepiece at a comfortable angle.
Related terms
- Barlow lens — A lens before the eyepiece that doubles the effective focal length.
- 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.