EXPOSURE How we can manipulate shutter speed, aperture & ISO to achieve different visual results.

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

Transcript of EXPOSURE How we can manipulate shutter speed, aperture & ISO to achieve different visual results.

EXPOSUREEXPOSUREHow we can manipulate shutter

speed, aperture & ISO to achieve different visual results

How we can manipulate shutter speed, aperture & ISO to achieve

different visual results

Pin Hole CamerasPin Hole CamerasFirst camera-like device invented by the Ancient Chinese & Greeks

Consists 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 surface

Film or Sensor

RECAPRECAPCamera = device that captures reflected light

First camera was the pin-hole invented by the Ancient Chinese & Greek

Exposure = the amount of light the film or sensor is exposed to

Photographers 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 light

lower ISO = less sensitive = less grain = less noise

Higher ISO = more sensitive = more grain = more noise

Don’t have a tripod?Don’t have a tripod?You can use ANY FLAT, STILL surface as a tripod!

TableChairLedgeLadderCabinet

Counter 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-stop

Measured in f-stop

Smaller number = bigger hole =

more light

Smaller number = bigger hole =

more light

Larger number = smaller hole =

less light

Larger number = smaller hole =

less light

Why not use a high ISO all the time?Why not use a high ISO all the time?

The higher your ISO, the more you will see “grain” and “digital noise” in your picture

Use as low an ISO as possible!

Better cameras cope with this better than cheaper ones

More important that megapixels! Pixels

Which has the high ISO?

Depth of Field

Depth of Field

The area of your picture that is in focus.The extent to which your picture is in focus

through space

LARGE

SMALL

Lots in focusHigh f-stop

Small area in focusLow f-stop

Which has the higher aperture?Which has the

higher aperture?

High f-stop = smaller hole =

large dof =more in focus

Shallow (small) DOFShallow (small) DOFLow f-stop (small #, big hole) = SHALLOW DEPTH OF FIELD

Less of the picture is in focus

Lots of blurry parts

Lots of “depth” shown

Depth = sense of going ‘backwards’

Deep (large) DOFDeep (large) DOF

High Aperture used (high #, smaller hole) = Deep Depth of Field

MORE parts are in focus

LESS sense of “depth”

Small or Large DOF?Small or Large DOF?Shallow Deep

LARGELARGE

SMALLSMALL

LARGELARGE

LARGELARGE

SMALLSMALL

SMALLSMALL

SMALLSMALL

Reminder:25 Repetition & Patterns pictures due Tuesday

Next Tuesday: 25 Shadows/Reflections!