Quote:
Originally Posted by bobbyz
Benji,
When I said, "keep the same exposure on my subject" I meant that I adjusted my main light (as I moved the subject 5 feet closer) to make sure my subject was still gtting f8 at the new position.
|
Bobby,
If the correct meter reading was F 8 on the subject at the first position (and the aperture of the camera was also at F 8 ) and then you move the subject five feet
closer to the background, and maintain the same F 8 exposure on the subject (and of course on the camera also) the background will now be overexposed by an additional one stop (or so) again this is due to the inverse square law.
Overexposing a background this much however could cause ghosting problems around the edges of the subject because the background is receiving considerably more light than what is actually needed to make it white. You really only need 2/3rds of a stop more light than what is on the subject to make the background white. This is one time when too much of a good thing is really too much of a good thing.
Benji