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I am puzzled!
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Jun 24, 2019 10:29:44   #
leftyD500 Loc: Ocala, Florida
 
I am shooting with the D750 and a Ynognuo YN968 speed light. When shooting high speed sync, the speed light will work when I am inside my house. But, when I go outside, it doesn't work. The flash will flash on the first shutter trip, no flash after that. If I shoot a series of 5 shots, the first one is with flash, the last four, no flash. Please don't tell me to read the manual, and check my setting, I have done that numerous times. Can anybody shed some light (no pun intended!) on my dilemma...why will it work indoors, but not outdoors?

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Jun 24, 2019 10:45:30   #
twowindsbear
 
Are you allowing enough time for the flash to recycle before you try to make another flash pic?

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Jun 24, 2019 10:54:00   #
leftyD500 Loc: Ocala, Florida
 
I am shooting continuous shooting, if I hold the shutter button down, it will take photos as long as I hold it down, I usually only take about 5 or 6 shots. Inside, the flash will flash every time the shutter trips. I can wait 5 minutes, go outside, press the shutter button, but the flash only flashes on the first shutter trip.

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Jun 24, 2019 10:57:25   #
pquiggle Loc: Monterey Bay California
 
I don't know the exact flash sync speed of the D750 but it is probably around 1/200 s. When using high speed sync at say 1/1000 s only 1/5 of the sensor is exposed at any one time and the flash will have to fire at least five times in 1/200 of a second interval. Indoors the reflective surfaces allow it to fire at a reduced output reducing the recycling time. Outdoors requires more light and the capacitor will be depleted more quickly, greatly increasing the recycling time as compared to indoors and it simply may not be able to produce those multiple flashes in such rapid succession.

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Jun 24, 2019 11:02:58   #
leftyD500 Loc: Ocala, Florida
 
pquiggle wrote:
I don't know the exact flash sync speed of the D750 but it is probably around 1/200 s. When using high speed sync at say 1/1000 s only 1/5 of the sensor is exposed at any one time and the flash will have to fire at least five times in 1/200 of a second interval. Indoors the reflective surfaces allow it to fire at a reduced output reducing the recycling time. Outdoors requires more light and the capacitor will be depleted more quickly, greatly increasing the recycling time as compared to indoors and it simply may not be able to produce those multiple flashes in such rapid succession.
I don't know the exact flash sync speed of the D75... (show quote)


pquiggle, when I am inside, the lighting is not near as bright as when I am outside. I am not trying to argue with your hypothesis, could it possibly be the light outside is too bright?

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Jun 24, 2019 11:23:24   #
pquiggle Loc: Monterey Bay California
 
If it is bright out then I am assuming you are using the flash as a fill light. If that is the case then the small aperture needed to correctly expose the ambient lighting will require a much greater flash output to balance it, hence the longer recycle time required between the flashes.

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Jun 24, 2019 15:14:30   #
leftyD500 Loc: Ocala, Florida
 
I have figured out my problem. I am expecting the flash to do what it is not designed to do. My faulty thinking was about high speed sync. I was thinking it meant the flash would fire in rapid succession, did not matter the lighting situation. I now have found out, it only refers to shutter speed, not burst speed.

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Jun 24, 2019 20:51:16   #
amfoto1 Loc: San Jose, Calif. USA
 
Generally speaking, flash cannot be used when a camera is in continuous shooting mode.

MAYBE you can get 2 or 3 or more "pops" out of it when it's only serving as a low powered "fill" flash.

But, any time the flash needs to fire more powerfully, due to distance or because it's in High Speed Sync mode or whatever, you'll likely only get a single flash before it needs to pause to recycle and recharge the capacitor.

You may be able to use a different type of battery or supplemental battery power to make it recycle faster and more fully, possibly getting another pop or two out of it before it has to pause.

You have to be careful though, firing a flash too rapidly can cause it to overheat. Many flashes have protection that shuts them down when they overheat and won't let the flash fire at all for ten or fifteen minutes or until it's cooled down.

I use Canon flashes and have compact battery packs to supplement them, which hold eight additional batteries. They recycle a lot faster with 12 AA batteries, than they do with only the fourthat fit inside the flash.

I don't know if there are supplemental battery packs available for Yongnuo flash... But I bet there are. Some are "universal" rechargeables, such as large Quantum batteries. Others are the type I use... smaller packs that hold standard AAs. Check out the Yongnuo website to see if they offer anything. But even if not, there may be other brands that will work.

I also use high quality rechargeable AA batteries, which seem to help speed up recycling, compared to alkaline AA batteries. They also give me more shots on a full charge, than fresh alkalines do.

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Jun 25, 2019 06:41:10   #
CO
 
jradose wrote:
I have figured out my problem. I am expecting the flash to do what it is not designed to do. My faulty thinking was about high speed sync. I was thinking it meant the flash would fire in rapid succession, did not matter the lighting situation. I now have found out, it only refers to shutter speed, not burst speed.


The flash does fire in rapid succession when doing high speed sync. It fires thousands of times per second.

You don't want to have the camera in continuous mode when using high speed sync. The flash is already doing all it can to fire at thousands of times per second. With the D750 it would be meant to be used when the camera is in single shot mode with a shutter speed in the 1/200 to 1/4000 second range.

Just to make sure, you did select Auto FP mode in menu option e1?

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Jun 25, 2019 07:01:57   #
Notorious T.O.D. Loc: Harrisburg, North Carolina
 
If I recall correctly my Canon 600EX-RT flashes pulse at 30,000 times per second in HSS mode. Adding additional battery pack will help with recycling time but no Speedlite will keep up with continuous shooting mode that I am aware of.

Is you continuous shooting speed adjustable? You may be able to slow down the number of frames per second to a point where the Speedlite can keep up better. My camera allows the number of FPS to be adjusted in continuous mode.

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Jun 25, 2019 07:38:17   #
GENorkus Loc: Washington Twp, Michigan
 
jradose wrote:
I am shooting with the D750 and a Ynognuo YN968 speed light. When shooting high speed sync, the speed light will work when I am inside my house. But, when I go outside, it doesn't work. The flash will flash on the first shutter trip, no flash after that. If I shoot a series of 5 shots, the first one is with flash, the last four, no flash. Please don't tell me to read the manual, and check my setting, I have done that numerous times. Can anybody shed some light (no pun intended!) on my dilemma...why will it work indoors, but not outdoors?
I am shooting with the D750 and a Ynognuo YN968 sp... (show quote)


Some have eluded to it.

Indoors you have flash bounce. That cuts down on the amount of light needed from the flash. Not nearly as much recharge is needed.

Outdoors you basically have no bounce. The flash needs to put out 100% each time.

Bottom line, outdoors needs to recharge alot before being used again.

To check it out, try using your flash indoors but at a much greater distance.

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Jun 25, 2019 08:40:03   #
abc1234 Loc: Elk Grove Village, Illinois
 
Are you in an automatic exposure mode that might be sensing it has enough light and does not need the flash?

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Jun 25, 2019 12:53:46   #
Kozan Loc: Trenton Tennessee
 
jradose wrote:
I have figured out my problem. I am expecting the flash to do what it is not designed to do. My faulty thinking was about high speed sync. I was thinking it meant the flash would fire in rapid succession, did not matter the lighting situation. I now have found out, it only refers to shutter speed, not burst speed.


High speed sync is not for shotting multiple frames. You take one picture. Set your camera's sync speed to 320*, then you can set your shutter speed to 1/4000s or whatever you need. I usually shoot outdoor flowers at 1/4000s and f/11. Makes for a great flower shot with a black background, even in daylight.

Good luck.

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Jun 25, 2019 13:31:49   #
ecurb1105
 
jradose wrote:
I am shooting continuous shooting, if I hold the shutter button down, it will take photos as long as I hold it down, I usually only take about 5 or 6 shots. Inside, the flash will flash every time the shutter trips. I can wait 5 minutes, go outside, press the shutter button, but the flash only flashes on the first shutter trip.


Indoors you only use part of the flash units stored energy so multiple flash exposures are available. Outdoors you dump all your stored energy on your first exposure until the flash recharges. Shoot single exposures outdoors and wait till the flash ready light comes on.

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Jun 25, 2019 14:44:31   #
Bill P
 
Only a few have gotten this right. The problem is the person behind the camera. I have a Quantum flash and battery, and on continuous I will get but one flash out of it. Then I have to wait till the beep to shoot another. You are expecting something out of a strobe that it was never designed or intended it to do. There's a reason that they put lights on strobes called READY lights, and some have beepers. You don't shoot again till the light says the strobe is ready.

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