Exposure Triangle Flashcards
What is aperture.
Aperture is the small opening in the lens that controls the amount of light that gets into the camera.
How is aperture expressed
In f-stop numbers e.g. F2.8 or f/2.8
What will lower f-stops do
Low aperture let more light into camera and produce a s,all depth of field.
What is meant by a small depth of field.
Closest objects will be in focus and the background will be out of focus.
What do higher f-stops do
High aperture means less light into the camera and produce a large depth of field.
What does large depth of field mean
Sharper background and pretty much everything will be in focus.
What is a key thing to remember about aperture
The larger the aperture the smaller the f-stop number. F/1.4 is a wide lens opening and a small depth of field.
Shutter speed
Represents the time that the shutter stays open when taking a photo.
What is shutter speed measured in
Seconds of fractions of a second. E.g. 1/1000, 1/750 , 1/250 = 250th of a second
1/2000 is what type of shutter speed
Very fast shutter speed
1/30 is what type of shutter speed
slower shutter speed
The slower the shutter speed….What happens to time
The more time the shutter is left open, therefore More light is entering the camera.
Correct exposure
Aperture and shutter speed work together to ensure correct exposure.
The right amount of light has exposed the image sensor.
What type of shutter speed would you have if the aperture was large
1/1000 = quite a fast shutter speed to have correct exposure.
What would’ve happen to shutter speed if aperture was small.
Around 1/60 = slow shutter speed to have correct exposure.
What would a faster shutter speed do to images
Freeze your images.
Which is useful in sports images moving water or any fast moving object.
What will a slow shutter speed do to your images.
Creates motion blur where moving objects appear blurred along the direction of the motion. Used in low level light and night photography.
Allows shooting at lower light, may need tripod
1/60th is slowest shutter to hand hold.
ISO
Is the measure of the camera sensors sensitivity to light.
The lower the iso number
The less sensitive the ca era is to light.
The higher the iso
The cameras sensitivity to light will increase
What does higher sensitivity add to an image
Adds grain or noise to the image.
What can iso allow allow you to do in low light situations
Allows your to avoid using flash p.
What is the main reason for selecting a higher sensitivity setting
Allow you to hand hold e camera at lower light levels
White balance
Each light source has its own individual colour, or colour temperature, which varies from red to blue.
Why do we adjust white balance
To get the colours in our images as accurate as possible , to get the whites looking white instead of yellow or bluish.
What is a rule to follow when adjusting white balance.
Set white balance to the light you are experiencing. I,e select cloudy setting on a cloudy day.
Colour temperature
The higher the kelvin number the white the colour of the light.
Incandescent
Gives a bluish tint to the image
Fluorescent
Gives a purple tint to the image
Direct sunlight
Similar to what the eye sees orange hue to image
Shade
More blueish tint to image
Cloudy, twilight, sunset
More blue tint to image
Tungsten light
Orange/ yellow tint to adjust light
Flash use
More blueish tint to adjust
