Exposure is the amount of light that reaches the camera sensor when the shutter button is pressed. It’s determined by three factors:
- Shutter speed
- Exposure index (ISO)
The aperture or f-stop is the hole in the middle of a camera lens. It controls how much light enters the lens, which affects exposure and sharpness.
Wider apertures (lower f-numbers) allow more light in, allowing you to shoot with a faster shutter speed and/or a lower ISO. They also have a shallower depth of field.
Smaller apertures (higher f-numbers) have greater depth of field. These can be beneficial for landscape photography.
Shutter speed (or exposure time) refers to how long the physical shutter on a camera is open, exposing the sensor to light coming in through the lens.