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Freeze action

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4x6
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Posted Fri Oct 5, 2012 7:52AM
How do people freeze action when they are outside in the daylight where there is ambient light (sun light) and they want to use a strobe or speedlight? The camera will only sync up to 1/125 before it won't sync up with the flash. 
lostinbids
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Posted Fri Oct 5, 2012 8:32AM

What flashes are you using? And why are you only using 1/125s?


If you are using speedlites then you can use the highspeed sync setting.  If you are using big strobes then there are some work arounds but they can be hit and miss.


If it is that bright then a reflector may be the best way to go.
4x6
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Posted Fri Oct 5, 2012 8:42AM
I can use either

a) studio strobes - bowens 500 pro
or
b) canon speedlites 

I'm only using 1/125 because the camera shutter can't sync to the studio strobes at a faster shutter.

I'm not actually shooting outdoors, I'm really shooting in my studio with a projected image as backdrop. It just simplier to explain it in the initial post as if I were shooting outdoors.  I figured ambient light is ambient light, regardless if I'm in doors or out doors. That is the issue I'm dealing with. 

Right now I'm trying to work out if there is some way to do action shots against a projected background. I already know how to freeze action when there is little to no ambient light. I do that with my speedlites. The speedlites fail to freeze motion when I'm shooting with the projected image as a background.

I don't know much about highspeed sync, so I'm going to look it up now.  

(Edited on 2012-10-05 08:42:43 by 4x6)
sjlocke
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Posted Fri Oct 5, 2012 9:16AM
It isn't the same. The flash will blow out any light from the projector unless there is some huge separation between the two.
kelvinjay
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Posted Fri Oct 5, 2012 9:21AM
Or, use a Fuji X100 - sync speed of up to about 1/1000sec I think.
blackwaterimages
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Posted Fri Oct 5, 2012 9:45AM
Posted By kelvinjay:
Or, use a Fuji X100 - sync speed of up to about 1/1000sec I think.

I'm pretty sure its 1/4000th for the X100.
kelvinjay
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Posted Fri Oct 5, 2012 10:13AM
Even better
4x6
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Posted Fri Oct 5, 2012 10:38AM
I did some testing in the last hour. I think freezing a moving person in front of a projected background is not possible. The issue is that a projected background unlike a real scene outdoors has only a limited amount of light. So my camera must always balance for the projection first. Then the studio lights work around those settings. Even if I could do highspeed sync to get my model's action frozen, at such high sync speed, my projected background will go pretty dark. 

I have no allowance to change the F stop because I don't watch to change the depth of field. The ISO can't change either, because it is balanced for the brightness of the projection.

Hence, I give up.  
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