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August 23, 2003
Photography Exposure Tips
The first and best of all photography exposure tips is to understand what an ISO film speed number means. The ISO standard was created to rate the speed of different film emulsions. It is now being used to set the sensitivity levels on higher end digital cameras.
Why do the speed numbers seem to increase in odd increments?
While this appears strange, it really is very logical. Each step represents an increase in speed that is equivalent to 1/3rd of a camera exposure stop. A change of 1/3 of a stop in camera exposure is generally considered to be the smallest, noticeable change in exposure.
Posted by Don Tracy at August 23, 2003 08:39 PM