Equipment
口径
Aperture
The diameter of the objective — it sets light grasp and resolution.
Double the aperture and you collect four times the light.
Related terms
- 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.
- Exposure — How long a camera sensor collects light.