This is particularly useful when shooting video, as a modeling light, or as an AF assist beam (with Live View). The LED light can provide up to 3.5 hours of illumination with four fully-charged AA batteries . It will automatically shut off after 60 minutes of idle use to conserve battery power. If battery power is low the LED Light will not turn on, even if the flash ready light is lit, in which case you should replace the batteries .
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