EXPOSUREHow we can manipulate shutter speed, aperture & ISO to achieve different visual results

Pin Hole CamerasFirst camera-like device invented by the Ancient Chinese & GreeksConsists of a pin-sized hole that allows light to enter a box through a tiny hole and project an image of the object onto a surfaceFilm or Sensor

RECAPCamera = device that captures reflected lightFirst camera was the pin-hole invented by the Ancient Chinese & GreekExposure = the amount of light the film or sensor is exposed toPhotographers control how much light is let into the camera by manipulating:shutter speed - how fast the mirror opens/closes aperture - the opening in the lens bigger opening, smaller f-stop number, more light let in.smaller opening, bigger f-stop number, less light let in.ISO - how sensitive the film or sensor is to lightlower ISO = less sensitive = less grain = less noiseHigher ISO = more sensitive = more grain = more noise

Dont have a tripod?You can use ANY FLAT, STILL surface as a tripod!TableChairLedgeLadderCabinetCounter topthe floor

Does your camera have a timer setting?Set the camera up, put it on a short timerStep back and let the camera take the pic!

Long Exposure

Long ExposureSlow Shutter Speed

Short ExposureFast Shutter Speed

Short ExposureFast Shutter Speed

Measured in f-stopSmaller number = bigger hole = more lightLarger number = smaller hole = less light

Why not use a high ISO all the time?The higher your ISO, the more you will see grain and digital noise in your pictureUse as low an ISO as possible!Better cameras cope with this better than cheaper onesMore important that megapixels!Pixels

Which has the high ISO?

Depth of FieldThe area of your picture that is in focus.The extent to which your picture is in focus through space

LARGESMALLLots in focusHigh f-stopSmall area in focusLow f-stop

Which has the higher aperture?High f-stop = smaller hole =large dof =more in focus

Shallow (small) DOFLow f-stop (small #, big hole) = SHALLOW DEPTH OF FIELDLess of the picture is in focusLots of blurry partsLots of depth shownDepth = sense of going backwards

Deep (large) DOFHigh Aperture used (high #, smaller hole) = Deep Depth of FieldMORE parts are in focusLESS sense of depth

Small or Large DOF?ShallowDeep

LARGE

SMALL

LARGE

LARGE

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Reminder:25 Repetition & Patterns pictures due TuesdayNext Tuesday: 25 Shadows/Reflections!