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1

Turn your YN-560IV over and look at its foot. The reason why you can't do HSS with it is that it's a single-pin speedlight, and can therefore only receive the sync (fire) signal on that pin. It doesn't have the other pins to receive TTL or HSS/FP commands from the camera. You need a speedlight that can perform HSS and that has all four of the pins Nikon ...


0

For a camera to work with Nikon HSS, its specs must say HSS and must say "for Nikon". So the reason is that the Yongnuo YN560 IV spec does not mention either, so forget HSS that way. That model is a manual flash. A model like the Yongnuo YN-568 III (the one "for Nikon") does have HSS in its specs, and would be expected to work. Then the camera can ...


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In order for HSS to provide the multiple flash pulses from a single capacitor charge the flash's max output is automatically reduced to about 1/4 power. That might not be enough to drop a bright BG as far as you would like. From that point on the shutter speed cuts the flash output and ambient equally. But because the ND cuts the flash output and ambient ...


6

Just to get the full understanding: Only to freeze fast moving subjects which need shorter shutter speeds than the flash's burning speed HSS is really required? Sort of. That is a common reason to use HSS, but there are also other use cases where HSS may be preferable to using ND filters. When you also want to use narrower apertures interspersed with wide ...


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