controlling light to achieve. exposure is the quantity of light reaching a photographic film, as...
TRANSCRIPT
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