Reply to thread

Message

<blockquote data-quote="WayneF" data-source="post: 229394" data-attributes="member: 12496">You said &quot;indoors&quot;, so I have to point out more details of how it really works.Indoors, generally we can assume the ambient is 2 to 4 stops down, and insignificant.&nbsp; We are using flash instead.&nbsp;&nbsp; (I am ruling out using very high ISO to boost the orange ambient).If you use FP flash mode and 1/500 second, all you have to stop motion is the 1/500 second shutter.If instead, you use regular flash mode and say 1/200 second (or even 1/60 second), the ambient is still insignificant (even at 1/60 second).&nbsp; It is too dim to blur the action.&nbsp; But you have the speed light, which is intensely fast.&nbsp; Since FP mode is no more than only about 20% of maximum power, any where FP could work, we can assume the speed light is operating at only 1/4 power (or less).&nbsp;&nbsp; See the spec chart in the rear of the flash manuals for flash duration, and at 1/4 power, the speedlight duration is only about 1/3000 second (fast).1/3000 second is much faster than 1/500 second. Stops motion incredibly well. Indoors the ambient is too dim to matter.&nbsp; &nbsp;&nbsp; And at lower power levels, the speedlight becomes unimaginably even faster... up to maybe 1/40,000 second.&nbsp; The speedlight is the standard motion stopping high speed photography tool (but this needs to be in dim ambient, so the ambient does not blur the action).See <a href="http://www.scantips.com/lights/flashbasics2b.html#speed" target="_blank">Four Flash Photography Basics we must know - Auto FP and HSS</a>&nbsp; for a comparison at 1/8000 second</blockquote>

[QUOTE="WayneF, post: 229394, member: 12496"] You said "indoors", so I have to point out more details of how it really works. Indoors, generally we can assume the ambient is 2 to 4 stops down, and insignificant. We are using flash instead. (I am ruling out using very high ISO to boost the orange ambient). If you use FP flash mode and 1/500 second, all you have to stop motion is the 1/500 second shutter. If instead, you use regular flash mode and say 1/200 second (or even 1/60 second), the ambient is still insignificant (even at 1/60 second). It is too dim to blur the action. But you have the speed light, which is intensely fast. Since FP mode is no more than only about 20% of maximum power, any where FP could work, we can assume the speed light is operating at only 1/4 power (or less). See the spec chart in the rear of the flash manuals for flash duration, and at 1/4 power, the speedlight duration is only about 1/3000 second (fast). 1/3000 second is much faster than 1/500 second. Stops motion incredibly well. Indoors the ambient is too dim to matter. And at lower power levels, the speedlight becomes unimaginably even faster... up to maybe 1/40,000 second. The speedlight is the standard motion stopping high speed photography tool (but this needs to be in dim ambient, so the ambient does not blur the action). See [URL="http://www.scantips.com/lights/flashbasics2b.html#speed"]Four Flash Photography Basics we must know - Auto FP and HSS[/URL] for a comparison at 1/8000 second [/QUOTE]

Verification