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Message: <blockquote data-quote="Geoffc" data-source="post: 300681" data-attributes="member: 8705">The fast lens reduces the flash power requirement as it only cares about aperture not shutter speed, so F2.8 requires half the power of F4. Therefore twice as many shots per charge cycle. If the flash is fully charged and you set it to 1/8 power, it should fire about 8 times per charge. I've done this at a wedding where I wanted fill flash for the confetti being thrown where I shot 6 or so frames.  My SB900 also has a strobe feature where the flash will fire many times on a single frame. I've not really got beyond playing with that feature.</blockquote>