In Photography, What does Exposure Triangle means ?
In terms of Photography, Exposure Triangle is comprised of these three elements, namely ISO, Shutter Speed, Aperture. Each of the three aspects of the triangle relate to light and how it enters and interacts with the camera.
1) ISO - The measure of a camera sensor’s sensitivity to light is called ISO. It is measured in numbers. The lower the number the lower the sensitivity of the film and the finer the grain in the shots you’re taking. Higher ISO settings are generally used in darker situations to get faster shutter speeds. For example an indoor sports event when you want to freeze the action in lower light. However the higher the ISO you choose the noisier shots you will get. 100 ISO is generally accepted as ‘normal’. Most people tend to keep their digital cameras in ‘Auto Mode’ where the camera selects the appropriate ISO setting depending upon the conditions you’re shooting in.
Situations where you might need to push ISO to higher settings include:
- Indoor Sports Events
- Birthday Parties
2) Aperture - Aperture is ‘the opening in the lens.’The aperture that you set impacts the size of that hole. The larger the hole the more light that gets in – the smaller the hole the less light. Aperture is measured in ‘f-stops’.
3) Shutter Speed - Shutter speed is ‘the amount of time that the shutter is open’.
- Shutter speed is measured in seconds
- In most cases you’ll probably be using shutter speeds of 1/60th of a second or faster.
- When considering what shutter speed to use in an image you should always ask yourself whether anything in your scene is moving
- If you’re using a slow shutter speed (anything slower than 1/60) you will need to either use a tripod or some some type of image stabilization.
It is at the intersection of these three elements that an image’s exposure is worked out.