Accurate ExposureControlling light to achieve

What is an Exposure?

exposure is the quantity of light reaching a photographic film, as determined by shutter speed and lens aperture.

How do you measure light?

With a light meter! Light meters quantify light.

Light Meters

Hand Held

Digital Meter

On Camera

In Camera

Light meter report

The light meter takes into account the ISO of the film and reports back with a suggested Shutter Speed and Aperture setting.

Use the meter reading as a guideline Make changes based on the subject

and the desired effect.

The Triangle of Accurate Exposure

ISO Shutter Speed Lens Opening

ISO

ISO is the speed of the film. Film speed indicates the relative

sensitivity to light. We use ISO 400 black and white film

Gray Cards

Light meters see light and dark areas and average the brightness to give you the correct exposure.

Use a 18% Gray card held up in the area you want to photograph.

The light meter off the gray card will give you an accurate exposure reading.

Point the camera at the Gray Card

Camera Settings

Control your image with proper use of camera settings

You can get different effects and a correct exposure by knowing your camera settings

Full Auto

The camera sets shutter speed and aperture based on meter reading

This is a guideline to adjust from

Shutter Speed

Shutter –Priority AE Mode You set the shutter speed the

camera selects the f- stop, or Aperture

Fast Shutter Speed

Lets in less light Can freeze action 1/250 or faster

Fast shutter/Slow shutter

Slow Shutter Speed

Lets in more light Show flowing movement Caution image may be blurry! 1/60 of a second or less

Fast shutter/Slow shutter

Aperture

F-Stops

Aperture-Priority AE Mode

You select the F-Stop, the Aperture, the camera selects the Shutter Speed

Aperture-Priority AE Mode

You select the F-Stop, the Aperture, the camera selects the Shutter Speed

The bigger the number the smaller the Aperture.

The smaller the Aperture, the less light into the camera.

The smaller the Aperture, the greater the depth of field.

F - Stops

Aperture-Priority AE Mode

You select the F-Stop, the Aperture, the camera selects the Shutter Speed

The Smaller the number the bigger the Aperture.

The bigger the Aperture, the more light into the camera.

The bigger the Aperture, less depth of field.

Depth of Field

Depth of Field

Small aperture Less light Deep depth of field

Large aperture More light Shallow depth of

field

Shallow/Deep depth of field

F/16

Small Aperture less light Deep depth of field

Deep Depth of Field

F/2.5

Large Aperture Lots of light Shallow depth of field

Shallow Depth of Field

This is Photography!

Use the meter

Get a suggested correct settings Decide what effect you want for the

image Make adjustments to the exposure

settings

Types of images you can create

Freeze motion with fast shutter Blur motion with slow shutter Deep depth with a small aperture Shallow depth with a large aperture