Aperture Definitions

Aperture/F-stop
- The setting of an adjustable lens aperture, indicated by an f number
- Aperture is expressed as an f-stop

Aperture Priority
- Digital camera setting
- You chose the aperture size, camera choses shutter speed

Ambient Light
- Light surrounding environment or subject
- Soft, indirect, fills room

Artificial Light
- Man made lighting or illumination to achieve practical or aesthetic effect
- Lamps, light fixtures

ASA/ISO/Film Speed
- Measure of camera sensor's sensitivity to light
- ISO/ASA describes how quickly it reacts

Bracket
- Shooting various photos of the same subject and viewpoint at different exposure (aperture) levels

Depth of Field
- The range in distance in front and behind an object focused by the camera

Exposure Triangle
- Three aspects that relate to how light enters and interacts with the camera
- Aperture, ISO, shutter speed


How to Control Depth of Field
Aperture Size:
- Smaller lens aperture size (f-number), greater depth of field
- Larger lens aperture size, shallower depth of field
Camera to Subject Distance:
- Farther away from focused subject, increased depth of field
- Closer to focused subject, decreased depth of field
Lens Focal Length:
- Zoom out, increased depth of field
- Zoom in, decreased depth of field

Light Meter
- An instrument used to measure the amount of light in a certain place or upon a certain object
- Equipped to convert these measurements into usable info (ex: Shutter speed and aperture size required)