Each setting controls exposure differently: Aperture: controls the area over which light can enter your camera. Shutter speed: controls the duration of the exposure. ISO speed: controls the sensitivity of your camera's sensor to a given amount of light.

What do all the symbols on a camera mean?

“M” – Represents “Manual” mode. Manual means the camera is handing over complete control of the exposure to you. This means you control the aperture AND shutter. ... Green Camera Symbol (Auto) – Represents “Automatic” mode. Automatic means the camera is in complete control of the exposure.

What quality setting should my camera be on?

'High' or 'Fine' gives the best quality but the biggest files, 'Medium' or 'Normal' gives decent quality but smaller files, while 'Low' or 'Basic' means very small files but a visible quality loss. We always recommend 'Fine' quality for JPEGs – the files are bigger, but heck, you can just buy a bigger memory card.