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Review title: very weak, does not work with preflashing cameras
Product review: This has a guide number (GN) of about 10-20 ft at ISO 100, i.e. very weak. This GN was computed from the dial on the unit. The specs don't spell out the GN. I haven't checked whether it actually delivers that power. Even a GN of 20 is very weak (e.g. 5 ft at f/4, ISO 100).This flash uses 2 AAA batteries. Why not the longer-lasting AA? Why not 4 batteries?This flash will not work with cameras that have a pre-flash.I returned mine right away.
