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<blockquote data-quote="WayneF" data-source="post: 228567" data-attributes="member: 12496">I am not a fan myself.&nbsp;&nbsp; Using FP mode indoors would seem ridiculous.&nbsp; Unnecessary. But it can allow using flash at f/2.8 in bright sun, if it has enough range to reach.FP mode becomes a continuous light (for the duration of shutter curtain travel).&nbsp; This is quite different than regular flash mode.SB-700 manual page H-26 says FP mode has Guide Number 42 (DX, 24mm, full power).&nbsp; This GN is good for any FP shutter speed, since exposure is compensated by aperture for different shutter speeds (just like in sunlight, both are continuous, simply just &quot;on&quot;).But regular flash mode (SB-700 page H-24) says regular speedlight mode has Guide Number 92 (DX, 24mm, full power). And GN 46 at 1/4 power there.Page H-17 says SB-700 speedlight mode duration is 1/2857 second duration at 1/4 power.&nbsp;&nbsp; But technically, FP maximum is closer to 20% than 25% power, so it will be a bit faster than this.&nbsp; And speedlight becomes faster yet at lower powers, possibly extremely fast (like 1/40000 second, for water drop splashes and hummingbird wings, at close distance).&nbsp;&nbsp; And the speedlight does not require f/2.8 to work.&nbsp; Speedlights are called Speedlights.&nbsp;&nbsp; <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" /></blockquote>

[QUOTE="WayneF, post: 228567, member: 12496"] I am not a fan myself. Using FP mode indoors would seem ridiculous. Unnecessary. But it can allow using flash at f/2.8 in bright sun, if it has enough range to reach. FP mode becomes a continuous light (for the duration of shutter curtain travel). This is quite different than regular flash mode. SB-700 manual page H-26 says FP mode has Guide Number 42 (DX, 24mm, full power). This GN is good for any FP shutter speed, since exposure is compensated by aperture for different shutter speeds (just like in sunlight, both are continuous, simply just "on"). But regular flash mode (SB-700 page H-24) says regular speedlight mode has Guide Number 92 (DX, 24mm, full power). And GN 46 at 1/4 power there. Page H-17 says SB-700 speedlight mode duration is 1/2857 second duration at 1/4 power. But technically, FP maximum is closer to 20% than 25% power, so it will be a bit faster than this. And speedlight becomes faster yet at lower powers, possibly extremely fast (like 1/40000 second, for water drop splashes and hummingbird wings, at close distance). And the speedlight does not require f/2.8 to work. Speedlights are called Speedlights. :) [/QUOTE]

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