WHAT IS ISO? How sensitive the image sensor on the camera is to light The lower the ISO the less sensitive your camera is to light and the finer the grain Higher ISO is used in darker situations (low light) but can cause “noisy” or “grainy” shots Comparison Example - http://digital-photography-school.com/wp- content/uploads/old/iso-1.jpg
QUESTIONS TO ASK YOURSELF Light Is the subject well lit? Grain So I want a grainy shot or one without noise Tripod Am I using a tripod? Moving Subject Is my subject moving or stationary
LOW OR HIGH? Use Low ISO if: If there is plenty of light, I want little grain, I’m using a tripod and my subject is stationary I will generally use a pretty low ISO rating. Use High ISO if: If it’s dark, I purposely want grain, I don’t have a tripod and/or my subject is moving I might consider increasing the ISO as it will enable me to shoot with a faster shutter speed and still expose the shot well. Remember – Higher ISO’s can produce grainy or noisy shots
PARTICULAR SITUATIONS TO INCREASE ISO Indoor Sports When there is lower light and your subject is moving Concerts Lower light and no flash allowed Art Galleries, Churches, etc. Rules against flash and usually not well lit Birthday Parties Blowing out the candles in a dark room can give you a nice moody shot which would be ruined by a bright flash. Increasing the ISO can help capture the scene.
REFERENCEMost of the information for this PowerPoint was taken from:Rowse, Darren. "ISO Settings in Digital Photography." Digital Photography School. Digital Photography School, n.d. Web. 31 Jan. 2013. <http://digital-photography-school.com/ iso-settings>