Exposure Triangle- Aperture vs ISO vs Shutter speed
Most of the DSLR camera comes with auto mode, which automatically pick the right config of ISO,Shutter Speed,Aperture to take a picture.But, using auto mode we are limiting ourselves what we can achieve with it.A better understanding of ISO,Shutter speed and Aperture allow us to take full advantage of camera using manual mode.Lets understand Aperture,ISO,Shutter speed before moving to exposure triangle.
ISO
ISO is the sensistivity of the image sensor in the range(100,200,400,800,etc). A low iso will require more light Eg. if your shooting in a sunny day a lower ISO 100 works fine. Higher ISO is used when you need to capture at low light Eg. when your shooting at night.
Note:
If there is plenty of light, higher iso will add more noise or grains.
Higher ISO will help us to shoot at faster shutter speed.
Aperture
Aperture is the opening in the lens, when you hit the shutter release button, the light travels through the opening and hit the camera’s image sensor.Larger the hole, the more light is passed, Smaller the hole, less light is passed.It is measured in f-stops (f/1.4,f/2.8,f/5.6,f/8,f/22).Adding a f-stop will halve the size of the opening in your lens
Depth of field
Depth of field is part of image which gets sharpness and focus.If we have a larger part of the image it’s called deep depth of field, on the contrary it’s called shallow depth of field.Landscape shots will have aperture of f/16.The main factors that affect the depth of field is aperture, distance between the object and camera, and focal length of the lens.
Shutter speed
Shutter speed also known as exposure time, the length of time the image sensor is exposed to light.Shutter speed is measured in seconds.Shutter speed of 1/100 means 1/100th of a second or 0.01 seconds.Some cameras may omit the fraction and display 500.
changing the shutter speed from 1/125 to 1/60 means you have increased the shutter speed by 1 step.
Note:
Shutter speed slower than 1 second are shown by ˝ symbol.Shutter speed of 1 second or larger is expressed as 1˝,10˝,30˝.
Exposure triangle
Exposure triangle is associating the three factors that affect the exposure of image- Aperture,ISO,Shutter speed.we need to balance all the three factors to achieve desired outcome.Put your camera in manual try to experiment with the 3 attributes and understand how they affect the composition of the image.
