 Steve Warren |
Exposure calculations with bounced flash Hi all, I just figured out the subject-to-flash calculations by suing the flash guide number. My problem is, I'd like to do some work with bounced flash, how would I do this? I figured I could just take the distance from the flash head to the ceiling, then the ceiling to the subject, but then it wouldnt take into effect any light that may be absorbed by the ceiling. Anyone have any ideas, thoughts or expertise no this? Thanks!
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- Gregory LaGrange Contact Gregory LaGrange Gregory LaGrange's Gallery |
you have to do a best guess on what you've done before. A regular height stucco, or those ceiling tiles, maybe 1 stop open. If the ceiling looks kinda high, 2 stops. But then again, how smooth/rough it is, shiny surface. Could get a meter if you don't mind buying one.
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Steve Warren |
Thanks so much, I'll try some guesswork and then spend the money for a meter.
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Jed Manwaring |
An easier way than using the ceiling to bounce your light off of is to use a reflector card or a small diffusor, such as the Sto-Fen Omni Bounce, on your flash. This way you don't have to be concerned about the ceiling distance or surface. Bouncing off the ceiling is great when you can control the situation, but when you have to move around a lot it can be a problem. (I once did an assignment in a location that had lots of crystal chandeliers. You can imagine the problems this caused). Can you angle your flash up while it's on the camera? If you can, attach a piece of white cardboard to the back of the flash (to the top if the flash is facing forward). Tilt the flash up at about a 45 to 80 degree angle. What will happen is the light from your flash will hit the card and bounce forward towards your subject. At the same time some will also spill onto the ceiling and be reflected back. You can experiment with the size of the card (I wouldn't go bigger than 8x8") and the upward angle of the flash. If you can't angle your flash while on the camera, then you'll need a remote cord that will allow you to position the flash however you want.
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