Black bar in photo
Mar 20, 2014 19:10:46 #
I've attached 2 images. Both taken with my Canon 6D using 2 softboxes triggering speedlights. As you can see in the first one there is a black bar across the bottom. Does anyone know what causes that and how to correct it? When I choose SS faster than 1/160 sec. I get the bar.
ISO 100, 85MM, f/3.2 1/250
ISO 100, 85MM, f/3.2 1/125
Mar 20, 2014 19:16:06 #
gemlenz wrote:
I've attached 2 images. Both taken with my Canon 6D using 2 softboxes triggering speedlights. As you can see in the first one there is a black bar across the bottom. Does anyone know what causes that and how to correct it? When I choose SS faster than 1/160 sec. I get the bar.
Looks like a shadow. There is a fold in the fabric.
Mar 20, 2014 19:16:44 #
that's not it...
selmslie wrote:
Looks like a shadow. There is a fold in the fabric.
Mar 20, 2014 19:17:33 #
Sorry I can't give an exact answer but I believe the shutter is not synchronizing with the flash.
Dennis
Dennis
Mar 20, 2014 19:18:37 #
really... there are 2 flashes.. and when I set it at 1/125 everything looks fine....
dennis2146 wrote:
Sorry I can't give an exact answer but I believe the shutter is not synchronizing with the flash.
Dennis
Dennis
Mar 20, 2014 19:22:11 #
gemlenz wrote:
I've attached 2 images. Both taken with my Canon 6D using 2 softboxes triggering speedlights. As you can see in the first one there is a black bar across the bottom. Does anyone know what causes that and how to correct it? When I choose SS faster than 1/160 sec. I get the bar.
The black bar at the bottom is because your shutter speed was too fast. The sensor was not fully uncovered when the flash fired. Check your manual for the flash max sync speed.
Mar 20, 2014 19:23:17 #
The camera manual or the flash manual?
selmslie wrote:
The black bar at the bottom is because your shutter speed was too fast. The sensor was not fully uncovered when the flash fired. Check your manusl for the flash sync speed.
Mar 20, 2014 19:23:22 #
You exceeded your maximum flash synch speed, 1/180 sec on the 6D. Your flash fired while the shutter was not completely open.
http://neilvn.com/tangents/maximum-flash-sync-speed/
http://neilvn.com/tangents/maximum-flash-sync-speed/
Mar 20, 2014 19:23:40 #
Your shutter speed is too fast. The vertical curtains of your shutter start to close before the flash fires. At higher shutter speeds the shutter never is completely open - the following shutter curtain starts to close before the leading shutter curtain is fully closed. The duration of the flash is extremely short and is timed to fire either at the beginning of the exposure or at the end. I'm a Nikon shooter so I don't know if you can change the sync speed on your camera or not. Some camera / flash combinations can fire a series of weak flashes so that the light from the flash is distributed across the complete time of the exposure. Best solution is to slow down your shutter speed. If the flash is your primary light source you don't have to worry about a slow shutter speed blurring your picture. Your effective shutter speed is actually the duration of the flash, which varies from 1/1000 sec to 1/10,000 sec. The problem comes when you try to use fill flash in bright sunlight. But thats another discussion for another day.
Mar 20, 2014 19:27:55 #
gemlenz wrote:
I've attached 2 images. Both taken with my Canon 6D using 2 softboxes triggering speedlights. As you can see in the first one there is a black bar across the bottom. Does anyone know what causes that and how to correct it? When I choose SS faster than 1/160 sec. I get the bar.
I have same problem with strobes and my canon 50D. Max shutter speed is problem. I think the strobes have a much longer delay than speedlites. I just stay at 125th. It really doesn't matter because the strobes will be around 750th of a sec, lower power speedlites probably around 2000th of a sec.
Ken
Mar 20, 2014 19:31:09 #
It appears the 6D has a sync limitation of 1/180 whereas the 7D has a higher value (1/8000 max shutter speed). Interesting...
Mar 20, 2014 19:31:44 #
Yes, shutter speed is too fast for camera/flash sync. If you need shutter speed faster than 1/180 you need to enable High Speed Sync (HSS) on camera and speedlight. How are you firing the flash, hotshoe, ETTL cable or wireless?
Mar 20, 2014 19:33:35 #
OddJobber wrote:
You exceeded your maximum flash synch speed, 1/180 sec on the 6D. Your flash fired while the shutter was not completely open.
http://neilvn.com/tangents/maximum-flash-sync-speed/
http://neilvn.com/tangents/maximum-flash-sync-speed/
Excellent link. The OP should read this - and I should read it again.
Mar 20, 2014 19:33:54 #
I'm using Cactus triggers. My 430 is on ETTL, Slave and my Yyoukono Is on manual.
A-PeeR wrote:
Yes, shutter speed is too fast for camera/flash sync. If you need shutter speed faster than 1/180 you need to enable High Speed Sync (HSS) on camera and speedlight. How are you firing the flash, hotshoe, ETTL cable or wireless?
Mar 20, 2014 19:34:57 #
gemlenz wrote:
It appears the 6D has a sync limitation of 1/180 whereas the 7D has a higher value (1/8000 max shutter speed). Interesting...
That 1/8000 is the maximum shutter speed, not the flash sync speed. Totally different things.
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