- Exposure is the amount of light collected by the sensor in your camera during a single picture.
- Pictures can either be too dark or washed out if left exposed too much or too little.
- Newer cameras determine the amount of exposure automatically.
- Cameras use shutter speed (the amount of time the sensor is exposed to the light) and aperture (the lens opening size that lets light into the camera.
- Shutter speed is measured in fractions of a second.
- Aperture is measured in f/stops.
- There aren't constant shutter speed or constant aperture because they control different things also.
- Shutter speed can also be used to freeze subjects in midair or blur water.
- Aperture controls the depth-of-field or focus.
- With most digital single lens reflex cameras you can change the sensitivity of the sensor when collecting light. (ISO Speed)
- The higher an ISO speed is (100- 800 normally) the faster a camera collects light. It also adds more noise to the picture with lower speeds.
Notes from:
http://www.picturecorrect.com/photographytips/ExposureBasics.htm
2 comments:
Some ideas for further research.
What are sample shutter settings?
What are some sample F-Stops? How is an F-Stop calculated?
What is a "Stop" (for shutter and for aperture).
What is the relationship between Shutter and Aperture? (Specifically based off of the settings you've talked about)
What camera settings allow you to set the aperture and shutter.
What is metering? How does the camera meter?
Respond to the questions above.
Also ... figure out ... if the camera automatically sets a scene to 1/60th second shutter and f8.0. And you want the shutter faster at 1/250th second ... what should the aperture be set to to get an equivalent exposure? (Reciprocity)
Once done with all of that. Read and review 3 other student's responses. Provide feedback, corrections, suggestions for research, links.
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