OFF THE FILM METERING - Known also by its initials, OTF metering is an exposure meter reading that measures light reflected from the surface of the film during exposure.
Off the film metering is a meter which determines exposure by reading light reflected from the film during exposure. Pioneered by Olympus on its OM2n. Most flash modes have OTF.
most basic Speedlite, the 220EX is fully compatible with E-TTL II operation and allows both FEL (flash exposure lock) and FP (high speed sync) on compatible Canon EOS bodies. The 220EX will operate in standard TTL mode using "off the film metering" ...
 See also: Metering, Film, Color, Image, Lens
  
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