Summer WorkshopsJuly 2010

Marcus Scott-TaggartChairman: Surrey Photographic Association’s

Judges’ & Lecturers’ Committee

Exposure getting all the detail you want in your photograph

Correct Exposure

Exposure getting all the detail you want in your photograph

Under Exposed

Exposure getting all the detail you want in your photograph

Over Exposed

Exposure getting all the detail you want in your photograph

Getting the right exposure requires balancing three different factors How sensitive to light the sensor in the camera is How bright the light is that falls on the sensor How long the light is allowed to fall on the sensor

Sensor

Performs the same function as film

set it to fast or slow, equivalent of film speed

Exposure getting all the detail you want in your photograph

Getting the right exposure requires balancing three different factors How sensitive to light the sensor in the camera is How bright the light is that falls on the sensor How long the light is allowed to fall on the sensor

Sensor Aperture

The Iris Diaphragm enables you to alter the amount of light than can pass through the lens

Exposure getting all the detail you want in your photograph

Getting the right exposure requires balancing three different factors How sensitive to light the sensor in the camera is How bright the light is that falls on the sensor How long the light is allowed to fall on the sensor

Sensor Aperture Shutter Speed

A = AutomaticEverything is decided by the camera

P = ProgrammableEverything automatic except what you want to change

M = ManualEverything has to be set by you

A = Aperture priority.You set the aperture and the shutter speed is set automatically

S (or T) = Shutter priority.You set the shutter speed and everything else is set automatically

Everything from foreground to background is sharp = very wide depth of field

Greater depth of field

Narrower depth of field

Narrowing the depth of field completely changes the point of interest in the picture

Limiting the depth of field stops the background from interfering with the main subject

The closer the camera is to the subject the narrower is the depth of field

Speeds can be as fast as 1/4000th of a second Speeds can be as slow as 15 seconds or longer 1 step on a fixed speed scale has the same effect

on the exposure as 1 step on the f/no. scale 1 step faster at a wider aperture is the same as 1

step slower at a narrower aperture 1/125th of a second at f/8 is the same as: 1/60th second at f/11 is the same as: 1/250th of a second at f/5.6