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Yongnuo YN-568EX Wireless TTL Flash Speedlite and triggers help
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<blockquote data-quote="WayneF" data-source="post: 543215" data-attributes="member: 12496"><p>I don't have the 622, but I think HSS ought to work the same way, on the 622, or on hot shoe directly. Assuming the subject distance from flash is comparable and close enough. Why it does not, I don't know the issue, someone else will have to help with the 622.</p><p></p><p></p><p></p><p></p><p>No, I mean the maximum power capability in HSS mode, enough to illuminate the subject in HSS mode. That is no simple matter. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>You probably need to know how HSS mode works... what it actually is.</p><p>see <a href="http://www.scantips.com/lights/flashbasics2b.html" target="_blank">Auto FP and HSS - What is it?</a></p><p>(see the picture there comparing speed of speedlight mode vs HSS mode).</p><p></p><p>In order that the the sync speed is not an issue for flash, the HSS mode has to change from speedlight flash mode to be a continuous light for the duration of the shutter travel duration. So it works like a continuous light, like a brief desk lamp instead of a flash. Continuous light has no sync limitations, any shutter speed works (if fast enough for Auto FP to actually switch to HSS mode to be continuous light).</p><p></p><p>Continuous light means it has to reduce maximum power level to maybe 20%, in order to be able to run continuously for the focal plane travel, maybe 1/300 second, which is a relatively long time for a flash. The range will be limited.</p><p></p><p>It means the Equivalent Exposure concept works for HSS flash too, same as for sunlight or other continuous light. Not like speedlight flash.</p><p></p><p>Which is a good thing, because fast shutter speed decimates continuous exposure. We might be able to set fastest shutter speed in sunlight, but we absolutely must open aperture wide to compensate for the extreme loss of exposure due to fast shutter. HSS is the same (continuous). And HSS only has about 20% power.</p><p></p><p>Which is really the only point of HSS... we can use fill flash (HSS, not flash) at f/2.8 in sunlight, by maximizing shutter speed to compensate for the aperture. Equivalent Exposures, assuming you want to use f/2.8 in sunlight. HSS lets flash work that way too. Otherwise, it is pretty unhandy. And HSS being continuous light, it cannot stop motion. All you have working for you is the shutter speed. We might imagine using it for the fast shutter speed, but the range is likely insufficient for most sports.</p><p></p><p>Speedlight flash mode is limited to maximum shutter sync speed. When the ambient is dim, where we usually use flash, this is really no issue at all. But other than allowing f/2.8 in bright sun with flash, speedlight mode runs circles around HSS mode, power, range, and speed. Speedlight mode is how high speed flash is done (called speedlight), for example, milk drop splashes or bursting water balloons. Speedlight mode is how flash stops motion, it can be much faster than any possible shutter speed. Beginners tend to imagine the frilly stuff must be good, but HSS is a special situation, and normally a strong disadvantage (unless you crave to use f/2.8 flash fill in bright sunlight). I don't know your use, but I'm assuming HSS is probably the wrong mode anyway.</p><p> See the picture at <a href="http://www.scantips.com/lights/flashguide.html" target="_blank">Beginners Guide to Select a Hot Shoe Flash</a> (scroll down a screen there to picture... that is speedlight mode, faster than any shutter speed). See also <a href="http://www.scantips.com/speed.html" target="_blank">Capability of flash units for high speed photography</a> about speedlight mode.</p></blockquote><p></p>
[QUOTE="WayneF, post: 543215, member: 12496"] I don't have the 622, but I think HSS ought to work the same way, on the 622, or on hot shoe directly. Assuming the subject distance from flash is comparable and close enough. Why it does not, I don't know the issue, someone else will have to help with the 622. No, I mean the maximum power capability in HSS mode, enough to illuminate the subject in HSS mode. That is no simple matter. :) You probably need to know how HSS mode works... what it actually is. see [url=http://www.scantips.com/lights/flashbasics2b.html]Auto FP and HSS - What is it?[/url] (see the picture there comparing speed of speedlight mode vs HSS mode). In order that the the sync speed is not an issue for flash, the HSS mode has to change from speedlight flash mode to be a continuous light for the duration of the shutter travel duration. So it works like a continuous light, like a brief desk lamp instead of a flash. Continuous light has no sync limitations, any shutter speed works (if fast enough for Auto FP to actually switch to HSS mode to be continuous light). Continuous light means it has to reduce maximum power level to maybe 20%, in order to be able to run continuously for the focal plane travel, maybe 1/300 second, which is a relatively long time for a flash. The range will be limited. It means the Equivalent Exposure concept works for HSS flash too, same as for sunlight or other continuous light. Not like speedlight flash. Which is a good thing, because fast shutter speed decimates continuous exposure. We might be able to set fastest shutter speed in sunlight, but we absolutely must open aperture wide to compensate for the extreme loss of exposure due to fast shutter. HSS is the same (continuous). And HSS only has about 20% power. Which is really the only point of HSS... we can use fill flash (HSS, not flash) at f/2.8 in sunlight, by maximizing shutter speed to compensate for the aperture. Equivalent Exposures, assuming you want to use f/2.8 in sunlight. HSS lets flash work that way too. Otherwise, it is pretty unhandy. And HSS being continuous light, it cannot stop motion. All you have working for you is the shutter speed. We might imagine using it for the fast shutter speed, but the range is likely insufficient for most sports. Speedlight flash mode is limited to maximum shutter sync speed. When the ambient is dim, where we usually use flash, this is really no issue at all. But other than allowing f/2.8 in bright sun with flash, speedlight mode runs circles around HSS mode, power, range, and speed. Speedlight mode is how high speed flash is done (called speedlight), for example, milk drop splashes or bursting water balloons. Speedlight mode is how flash stops motion, it can be much faster than any possible shutter speed. Beginners tend to imagine the frilly stuff must be good, but HSS is a special situation, and normally a strong disadvantage (unless you crave to use f/2.8 flash fill in bright sunlight). I don't know your use, but I'm assuming HSS is probably the wrong mode anyway. See the picture at [url=http://www.scantips.com/lights/flashguide.html]Beginners Guide to Select a Hot Shoe Flash[/url] (scroll down a screen there to picture... that is speedlight mode, faster than any shutter speed). See also [url=http://www.scantips.com/speed.html]Capability of flash units for high speed photography[/url] about speedlight mode. [/QUOTE]
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