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Daylight exposure with fill flash
Old 06-15-2005, 12:46 PM   #1 (permalink)
Steve_Kirby
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I have never really had that much success at really balancing fill flash with daylight. I want to use a strobe in a softbox for fill. For a medium fill, how many stops below the daylight exposure should I go? The model will probably in full shade. I shoot mainly negative film

Any hints would be appreciated greatly
 
 
Re: Daylight exposure with fill flash
Old 06-15-2005, 12:55 PM   #2 (permalink)
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I would normally set the flash to be from 1/2 to 1 1/2 stops less than the Main light (in this case the light in the shade). But you may want to bracket and see what works best for you. It really depends on what lighting ratio you want. If you made the flash the same power as the ambient light, then you would be at a 1 to 1 ratio. But that is not what usually works best, hence the lowering of the stops for the fill flash.
Cheers,
rfs
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Re: Daylight exposure with fill flash
Old 06-15-2005, 02:44 PM   #3 (permalink)
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Running some tests might be in order. Document everything and see how many stops over or under from ambient looks good.

E
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Re: Daylight exposure with fill flash
Old 06-15-2005, 06:33 PM   #4 (permalink)
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I usually shoot for approx (-1) stop.



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3 to 4 stops under for fill-flash, 0-stops for balancing fill.
Old 06-21-2005, 08:08 PM   #5 (permalink)
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Here's the deal..... the "fill" is not supposed to "light" the model. it is supposed to add to the shadows to reduce the dynamic range of the image. I don't like fill-flash that "looks" like fill-flash.

It is easier with digital... I sent the apeture to what I want for proper shallow DOF. Then I adjust shutter speed to expose the parts of the image that will *not* be affected by the flash properly w/o flash. I want an image that looks almost usable. Then just a small amount of fill, only 25 WS to 50 WS of fill with a softbox or umbrella.



For the purposes of illustration, I went back to the original raw unretouched and unmodified files. The image on the left is w/o the fill flash, the one on the right is with the strobe.

One way to get better fillflash is to find "dark" backgrounds... like green foilage. Never allow openly lit sand or light ground to be in the background or else it will either 1) blow out, or 2) you will have to change the exposure so much you will need way too much flash to compensate.

Now this is different from "balancing" fill when you use the strobe to "balance" or "equal" the sunlighed image, and the flash *is* the main light for the subject and without the flash, you have a nearly black, deeply shadowed model. Like this:



Set the apeture and shutterspeed for the sky/background, then adjust the location/power of the strobe to light the model. The difference between fill-flash is that essentially no ambient light is affecting the model here, where with fill flash, the ambient light *is* the main light for the model and the strobe is just reducing the bottom end of the curve and midtones, and not highlights. It *adds* to the light... it is not *the* light.
 
 
Re: 3 to 4 stops under for fill-flash, 0-stops for balancing fill.
Old 06-21-2005, 09:36 PM   #6 (permalink)
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Great demo Robert! [img]/ubbthreads/images/graemlins/smile.gif[/img]

JP
 
 
Re: 3 to 4 stops under for fill-flash, 0-stops for balancing fill.
Old 06-23-2005, 11:17 AM   #7 (permalink)
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Wonderful instructions. Thanks for sharing... Jim
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Re: 3 to 4 stops under for fill-flash, 0-stops for balancing fill.
Old 06-23-2005, 04:15 PM   #8 (permalink)
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now thats some good readin [img]/ubbthreads/images/graemlins/grin.gif[/img]

good reply!
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