A camera needs two things to control the amount of incoming light: The shutter and aperture. The shutter of a camera blocks out all the light from exposing the film until you press the button to take the picture with. It quickly opens and then closes which gives the film a quick flash of light. To control the length of time the shutter remains open, go to settings and change the shutter speed. The aperture is the opening, after light passes thorugh a cameras lens, that lets in more light when it's open and less when it's small. It is similar to the pupil in a human's eye. You can control the aperture by going to settings and changing the "Aperture Opening", also known as an F-stop. Film has some input in how a picture turns out too. Film reacts to light and the more light you "expose" it to, the brighter the image will be. You are able to buy all types of film for your camera, and they 'll all have a film speed. "Fast" films are more sensitive to light than "slow" films. It goes with the names!
The faster the shutter speed, the less light that is able to enter through the lens and aperture. The bigger number F-stop the smaller the aperture opens.
Info found at: http://www.photonhead.com/exposure/
1 comment:
Some ideas for further research.
You talk about film ... how does this apply to digital camera sensors.
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?
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