Exposure
Exposure is affected by adjustable three elements:
- shutter speed
- aperture
- film/sensor speed (ISO). These three elements in combination add up to the amount of light that enters a camera to create a single photograph. For a multiple exposure where a single frame is exposed more than once the total exposure is the combination of all the exposures for that frame.
There is no single correct exposure for a specific photograph. At ISO 100 a picture taken at f22 at 1/4 seconds allows the same amount of light to hit the film or sensor as a picture taken at f2.8 at 1/250 second. Of course, not many people can hand hold a camera at 1/4 of a second and get a sharp image and you don't have much depth of field at f2.8, therefore, every exposure is a compromise. The photographer must decide how much depth of field they need while also thinking about how much of the action they want to freeze (or blur), what focal length lens they are using, can they use some sort of support, etc.
Exposure Bracketing & Compensation
- You light meter wants to make everything gray - how to adjust for this based on your subject and lighting.
- over and under exposure - why would you deliberately want to over or under expose a shot.
Exposure Modes
- Aperture priority, shutter priority, manual and program - what are the pros and cons of each and when would you use them?
- Average, spot, center weighted and flash metering systems
- zone system
- Sunny 16
Links
- THE ULTIMATE EXPOSURE COMPUTER: Great articles on exposure geared towards nature photographers but useful for any kind of photographer.
- Wikipedia
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