Equipment
曝光
Exposure
How long a camera sensor collects light.
Nightscapes often use 15 s at f/2.8, ISO 3200.
Related terms
- Refractor vs reflector — Lens-based versus mirror-based telescopes.
- Star diagonal — The 90° eyepiece adapter on a refractor.
- Focal length — Distance from objective to focus.
- Field of view — How much sky you see at once, in degrees.