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CMS-XML QuickGuide to Canon 320EX Speedlite Features
The higher the flash output, the greater the maximum range. Use a hand-held flash meter or trial-and error to determine the correct aperture for a given flash-to subject distance. Once set, the exposure will remain the same as long as the distance and flash power level remain the same.
CMS-XML Added Control with Speedlite 470EX-AI's Personal Functions
Option 2 limits the tilting to a straight-upward position of 90°, and no farther. This means that Full-auto Bounce will more often tend to tilt the flash upward but facing slightly toward the subject — a bounce position many experienced photographers are comfortable working with. And, as just mentioned above, this can help avoid possible errors if you are working in larger venues, where walls may be distant and not immediately behind the photographer.