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<blockquote data-quote="WayneF" data-source="post: 382985" data-attributes="member: 12496"><p>On speedlights, 1/2 power is BOTH power level and relative to speed duration. This is true of Speedlights, and is the reason they are called speedlights. It would not represent almost all studio flash, which are not speedlights (very few are).</p><p></p><p>1/2 power on a moderate speedlight would be faster than 1/800 second.</p><p></p><p>Here is the chart from the Nikon SB-700 manual.</p><p></p><p>Flash duration (approx.)</p><p>1/1042 sec. at M1/1 (full) output</p><p>1/1136 sec. at M1/2 output</p><p>1/2857 sec. at M1/4 output</p><p>1/5714 sec. at M1/8 output</p><p>1/10000 sec. at M1/16 output</p><p>1/18182 sec. at M1/32 output</p><p>1/25000 sec. at M1/64 output</p><p>1/40000 sec. at M1/128 output</p><p></p><p>The full power level is misleading, that is the standard T.5 time, and is not truncated shorter (has a long trailing tail). T.5 measures the time that the power is above 1/2 peak. Full power actually would be about 3x longer, maybe 1/350 second.</p><p></p><p> The rest of the levels are truncated, and at least T.1 or better.</p><p></p><p>Explanation: Speedlights always flash at full power (full voltage), but control their power by truncating (quenching off) the flash duration. So, as more power is quenched off and the power becomes low, they also be tremendously fast.</p><p></p><p>Nikon says 1/2 power is 1/1136 second duration. This is typical.</p><p></p><p>I used to do water drop splashes at about 1/64 power, for immense speed stopping capability. The flash is pretty close to the water drop, so this low power easily works.</p><p></p><p>If this is your use (close water drops), then a hot shoe extension cable (like Nikon SC-28) would also work for a remote flash. However, the SC-28 cord is not very suitable for distances more than 3 or 4 feet.</p></blockquote><p></p>
[QUOTE="WayneF, post: 382985, member: 12496"] On speedlights, 1/2 power is BOTH power level and relative to speed duration. This is true of Speedlights, and is the reason they are called speedlights. It would not represent almost all studio flash, which are not speedlights (very few are). 1/2 power on a moderate speedlight would be faster than 1/800 second. Here is the chart from the Nikon SB-700 manual. Flash duration (approx.) 1/1042 sec. at M1/1 (full) output 1/1136 sec. at M1/2 output 1/2857 sec. at M1/4 output 1/5714 sec. at M1/8 output 1/10000 sec. at M1/16 output 1/18182 sec. at M1/32 output 1/25000 sec. at M1/64 output 1/40000 sec. at M1/128 output The full power level is misleading, that is the standard T.5 time, and is not truncated shorter (has a long trailing tail). T.5 measures the time that the power is above 1/2 peak. Full power actually would be about 3x longer, maybe 1/350 second. The rest of the levels are truncated, and at least T.1 or better. Explanation: Speedlights always flash at full power (full voltage), but control their power by truncating (quenching off) the flash duration. So, as more power is quenched off and the power becomes low, they also be tremendously fast. Nikon says 1/2 power is 1/1136 second duration. This is typical. I used to do water drop splashes at about 1/64 power, for immense speed stopping capability. The flash is pretty close to the water drop, so this low power easily works. If this is your use (close water drops), then a hot shoe extension cable (like Nikon SC-28) would also work for a remote flash. However, the SC-28 cord is not very suitable for distances more than 3 or 4 feet. [/QUOTE]
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