ISO Ratings


All exposure systems use the ISO rating as the basis for its calculations. ISO stands for International Standards Organization. The ISO rating is used on all cameras, even though it was originally developed to be a universal guide for film speeds. A film’s ISO rating indicates its sensitivity to light, or what is generally termed the film speed. The higher the ISO rating, the more sensitive it is to light. Digital cameras follow the same rating.

Changes in ISO ratings are measured in stops in the same way as apertures and shutter speeds. For example, changing the ISO rating from ISO 100 to ISO 200 is an increase in one stop.

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Ms. R.

About Ms. R.

Danielle Rochford has been a certified teacher for over 15 years, practicing her craft with middle school students in British Columbia, Canada. She is also a self-taught landscape photographer and founder of D-Roc Photography and Design. She has spent the past five years teaching online in such areas as English, Math, and Photography. She hopes to continue sharing her expertise with others now on Udemy. Danielle encourages her students to be interactive and provides many opportunities for discussion and feedback. In her spare time, she loves to travel and enjoy the solitude of nature. You will often find her traveling through Jasper, AB on a photography adventure.

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