Goal:Help you understand what decisions and adjustmentsare being made by your camera, and how you can takecontrol of your images.Please interrupt if you have questions or anything isn’tclear.
ExposureExposure is how light or dark the image is as capturedby the camera.
ExposureControlled by three things, working in conjunction Aperture, shutter speed, ISO
ApertureAperture is the opening in the lens that lets light into thecamera
ApertureAperture is measured in f stops f/1.4, f/2.0, f/2.8, f/4, f/5.6, f/8, f/11, f/16, f/22
ApertureDepth of field (DOF) = range of how far in front andbehind the subject you focused on will be acceptablysharp
ApertureDepth of field is controlled by your aperture settingLarger opening (small f stop number) = little DOFSmaller opening (large f stop number) = more DOF
Shutter SpeedShutter speed is how long you are letting light enter thecamera
Shutter SpeedSome common shutter speeds 1/30, 1/60, 1/125, 1/250, 1/500, 1/1000 (extends on both ends) Small numbers leave the shutter open for a longer time (slow) Large numbers leave the shutter open for a shorter time (fast)
Shutter SpeedNeed to use a shutter speed fast enough to stop theaction of your subject, and youThe longer the lens focal length, the faster speed youneed to hold the camera still and stop the action
Shutter SpeedRule of thumb: use a shutter speed at least the inverseof your lens focal lengthEg. with a 50 mm lens, use a shutter speed of 1/60 orfaster to hand hold the cameraWide angle lenses can be hand held with much slowerspeeds
Shutter SpeedBulb = Shutter stays open while button heldBulb and slow speeds require a tripod or similarsupport
ISOThe ISO is the sensitivity of your sensor or film.100, 200, 400, 800, 1600, 3200
Equivalent ExposureYou can adjust any two (ISO, Shutter Speed, Aperture)and still keep the same exposure.Eg. ISO 100, f/8, 1/500 = ISO 100, f11, 1/250
Before next week... Take your camera out and shoot some pictures in manual mode, using the ISO, shutter speed, and aperture settings. Bring in a couple of your favorites and we will view them and discuss.