Thursday 4 February 2010
Day 35 - Two flash windmill
This is a two flash set up, with two preliminary shots to show the effect of each flash. The first is lighting the background, which then throws light back through the translucent windmill. The second flash, screened off from the background, just lights the windmill from the right.
As usual, it was all triggered using the Cactus V4. I still need to learn exactly how to control the background light to get a clean white. I suspect in this case I needed a bit more juice from the flash and to increase the distance between the flash and subject so it wasn't overwhelmed by the reflected backlight.
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The simple answer to getting the background completely white is boost the flash power so the background becomes overexposed (I usually go over by about 1 stop) . This does mean increasing the distance between background and subject. If you're tight for space you could leave flash power the same but open up the aperture - you'll have to reduce the flash on the subject to compensate. Of course the problem of light bouncing back isn't such an issue when your subject is solid rather than translucent.
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