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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 14 Dec 2009 (Monday) 12:28
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slight ghosting on water drops with flash?

 
Coffee999
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Dec 14, 2009 12:28 |  #1

I wish I had an image to show as proof right now, but I don't. I'm sure some of you will know a solution anyway.

I'm into water drop photography. I have a 40d and 430ex, and for most of my shots, I will use 1/250 shutter as the sync with my flash. I change the settings of the flash to see what works best. I usually will use ettl on auto, but will also set flash to manual at 1/8-1/16 if I have enough light. But on many images, I see a slight ghosting of certain areas of the water drops. mainly around the highlights of the subject. Other times I see streaks of light either below or above the point of origin.

Can anyone direct me to the main cause of this and how to keep this from happening.

Thanks for any help, and I will try to produce an example when I can get to my main computer. Thanks.




  
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Wilt
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Dec 14, 2009 12:49 |  #2

Your problem might be that the ambient light is strong enough that some image is registering even without the flash. Use shutter speed and f/stop selection and ISO selection, so that your meter reads at least -2EV under the exposure with flash alone.


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Coffee999
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Dec 14, 2009 12:55 |  #3

Wilt wrote in post #9195815 (external link)
Your problem might be that the ambient light is strong enough that some image is registering even without the flash. Use shutter speed and f/stop selection and ISO selection, so that your meter reads at least -2EV under the exposure with flash alone.

You might be on to something here Wilt. I notice that when I was using hot lights in conjunction with the flash, the streaking and ghosting was much worse. So I turned off all light but the flash. It was during the day though so there was still some ambiant light present.

So if I were to take these same images in a room with very little ambient light, I will have less or no ghosting and light streaks? There must be a proper name for this anomaly hu?

Is there a way to use ambient light in conjunction with flash and not have this to happen?

Like I said before, I usually set the camera on manual using 1/250 shutter. I will adjust aperture as I change out different background, usually around 5.6-8.0. I always use ISo 400 unless I have a light backdrop where I can go to 200.




  
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40Dude6aedyk
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Dec 14, 2009 14:31 as a reply to  @ Coffee999's post |  #4

To get the shortest duration flash with a speedlight, you need to go to lowest output or 1/128. As you increase output to 1/64, 1/32, ... 1/1 the flash duration is longer. Look around on the web for a plot of flash intensity versus time. Links have been posted here before, so I apologize that I don't have a moment now to search for them and link again here.

So start with speedlight at 1/128 output and then adjust your camera body (ISO, SS, aperture) to get the exposure you want.


Canon 40D; Canon 70-200 mm f/2.8L IS, 17-55mm f/2.8 IS, 85 mm f/1.8; 580EX II; Sigma EF-530 DG Super; CyberSyncs

  
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Jim ­ M
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Dec 14, 2009 18:23 |  #5

With a 430 EX as close as I suspect it is with water drop photography, you should be able to use ISO 100 and just about any aperture you want to use to cut out the ambient light. I wouldn't worry about powering down the Speedlight to shorten the flash duration. It's already plenty fast enough. At ISO 400 and apertures of f/5.6 and f/8, I'm sure it's the ambient light that is causing your ghosting.




  
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40Dude6aedyk
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Dec 14, 2009 19:24 |  #6

Jim M wrote in post #9197834 (external link)
With a 430 EX as close as I suspect it is with water drop photography, you should be able to use ISO 100 and just about any aperture you want to use to cut out the ambient light. I wouldn't worry about powering down the Speedlight to shorten the flash duration. It's already plenty fast enough. At ISO 400 and apertures of f/5.6 and f/8, I'm sure it's the ambient light that is causing your ghosting.

Have you actually tried it?

See also: http://strobist.blogsp​ot.com …water-drops-with-one.html (external link)


Canon 40D; Canon 70-200 mm f/2.8L IS, 17-55mm f/2.8 IS, 85 mm f/1.8; 580EX II; Sigma EF-530 DG Super; CyberSyncs

  
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slight ghosting on water drops with flash?
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