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Why are my studio pictures dark when I use a slave flash

Apr 17, 2006 by Udi Tirosh Add Comment

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John writes:

Hi DIYPhotography,
I am using a D70 for my studio shots, and one external optical slave flash.  When I take a picture, the internal flash shoots, and triggers the external flash, and yet my pictures are dark.
Can you help me?

John

Click here to see DIYPhotography.net answer


This is what DIYPhotography.net has to answer

Hi John,

I do not know your entire setup, buy my guess is that your internal flash unit is set on iTTL.

When the flash is set to iTTL it shoots a short pre-flash to measure the strength of the flash needed for the shot. That pre-flash is done before the curtain opens. After the curtain opens, a stronger strobe is shot. And here is the catch, when the main strobe triggers your slave, the slave is uncharged, after the pre-flash discharge.

Here is what you can do to override the problem. Set your internal flash unit to manual at 1/16th of its strength. Now, place a small paper between the flash and camera body, so the internal flash will have a lowest impact on the final picture as possible.

Regards,

DIYPhotography.net


you are welcomed to ask more questions via the feedback form

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Udi Tirosh: from diyphotography.net

About Udi Tirosh

Udi Tirosh is an entrepreneur, photography inventor, journalist, educator, and writer based in Israel. With over 25 years of experience in the photo-video industry, Udi has built and sold several photography-related brands. Udi has a double degree in mass media communications and computer science.

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