move forward and back to bring objects at diferent distances into sharp focus.
in a film camera, it records the image transmitted by the lens.
adjust the amount of light reaching the fim or snsor. A large opening allows the most light to pass through the lens. The smallest opening lets the least amount of light in.
shows the picture that the lens focuses on the sensor or film.
in a digital camera, it converts the light from the lens into electrical signals that are sent to the memory card.
opens and closes to control the length of time that the light strikes the light sensitive surface.
Types of memory cards
1) CF- Compact Flash
2) SD - Secure Digitial
3) Memory Stick
4) XD - Picture
describes a sensor's or film's sensitivity to light. The higher the number the more sensitive (or faster).
developed with chemicals to a negative image, then printed on to paper to make a print.
produces a positive image directly on the film that was in the camera.
visible in the middle of the viewfinder.
Ground Glass Screen
displays a scene sharply when it is in focus. SLR cameras have this.
a small ring in which an object appears coarsely dotted until focused.
Split image focusing
part of the object is offset when it is out of focus.
Factors that control exposure
-Brightness of Subject
Exposure Read out
tells you about the shutter speed and aperture - it appears on the bottom of the screen in the viewfinder.
aka Programmed AutoExposure - each time you press the shutter the camera auto meters the light then sets what it determines it the best shutter speed and aperture combonation.
you set the aperture and the camera sets the shutter speed.
you choose the shutter speed and the camera sets the aperture.
Sunny 16 Rule
on a sunny day, set the aperture to f/16 and use the shutter speed closest to the ISO number. Example: If ISO is set at 100, use a SS of 1/125.
used to set manual or one of the serveral choices of automatic operations.
displays ISO, Shutter Speed, and aperture settings, the number of exposures remaining and other info.
Displays stored images and menu options for the camera settings.
for manually selecting shutter speed and/or aperture.
for manually focusing a lens.
keeps the shutter open as long as the release button is held down.
"T'" Time setting
opens the shutter with one press and closes it with another press/
are shutter speeds set by the camera in automatic exposure operation.
refers to a change in illumination, wether the shutter speed or aperture is changed to achive it.
To Give one stop more exposure
to double the amount of light reaching the sensor.
To give one stop less exposure
to cut the light reaching the sensor in half, by halving the exposure time or halving the size of the aperture.
consist of a number of small overlapping metal blades.
Focal Plane Shutter
consist of 2 overlapping curtains.
the highest shutter speed at which the opening curtain has completed its travel before the following cutain begins to move.
the size of the lens opening.