1. Digital Photography DeCal EECS98 Nathan Yan

2. Exposure “Stops” StopsExposureShutter speedApertureISO sensitivity -41/16x1/1600sf/22ISO50 -31/8x1/800sf/16ISO100 -21/4x1/400sf/11ISO200 1/2x1/200sf/8.0ISO400 01x1/100sf/5.6ISO800 +12x1/50sf/4.0ISO1600 +24x1/25sf/2.8ISO3200 +38x1/12sf/2.0ISO6400 +416x1/6sf/1.4ISO12800

3. Determining Exposure Manual exposure – "zone system", guess and check, histogram Auto exposure – tries to achieve an overall "middle grey" brightness Issues Built-in meters only see reflected light, instead of incident light Reflected light depends on reflectivity of surface, not just the amount of light Dark and bright objects can "fool" the camera's light meter

4. Solutions Exposure compensation: correcting metering errors by biasing metered value Metering modes: Evaluative/Matrix: analyzes entire scene Center-weighted: analyzes entire scene, with bias toward center Partial/Spot: only analyzes small center of the image

5. Shorter Longer Darker Brighter Smaller Larger Less sensitivity More sensitive 1/400s1/20s f/8f/2.8 ISO1600ISO100 SharperBlurrier More in focus Less in focus NoisierClearer

6. Program Modes ModeApertureShutter speedISOExposure Program (P)Auto Auto/ManualAuto Shutter Priority (S,Tv)AutoManualAuto/ManualAuto Aperture Priority (A,Av)ManualAutoAuto/ManualAuto Manual Which parameters do you want to control? Which parameters is it OK to let the camera decide? Thought experiment:

7. ModeApertureShutter speedISOExposure Program (P)Auto Auto/ManualAuto Shutter Priority (S,Tv)AutoManualAuto/ManualAuto Aperture Priority (A,Av)ManualAutoAuto/ManualAuto Manual Thought experiment: Sports in daylight

8. ModeApertureShutter speedISOExposure Program (P)Auto Auto/ManualAuto Shutter Priority (S,Tv)AutoManualAuto/ManualAuto Aperture Priority (A,Av)ManualAutoAuto/ManualAuto Manual Thought experiment: Indoor sports