ISO

Manual Techniques - ISO 

ISO - International Standards Organisation

• ISO enables to take images without using the flash and takes advantage of the natural light available in glommy conditions.
• As the light gets dimmer the ISO needs to be adjusted.
• ISO is set by M mode and selecting the set button which gives you the choice of ISO settings as shown below.
• The higher the ISO the greater the risk of 'noise' which makes images look 'granier'.

ISO 100 - Bright daylight, sunny conditions, hand held shooting, where clean images (no noise are priority)

ISO 200 - As for ISO 100, but where a faster shutter speed or a slightly longer focal length is required and   where you may also need flexibility with apertures and shutter speeds.

ISO 400 - Indoor or slightly overcast conditions, where you want to avoid using flash or you need fast shutter speeds and full aperture control to shoo hand held.

ISO 800 - Overcast or dark indoor shooting, sports or action photography, where you need to freeze the motion and noise issues are not a problem.

ISO 1250 - Low light or indoors, long lens shooting (hand held) at this level noise could become an issue.

ISO 1600 - Night time, low light, very long lens shooting.  Noise will be evident in shots.

ISO 3200 - As for previous ISO but where high shutter speeds are required.  Noise will be evident in shots.

Examples of different settings of ISO

ISO Setting: 200

ISO Setting: 1600