metering will do some kind of magic based on a proprietary algorithm to properly
expose what it thinks is important. Cameras like the LX with only center weighted
metering simply quench the flash when they average 18% grey. Distance is un-important
it's the amount of light reaching the film.
At 07:35 PM 12/29/2002 -0500, you wrote:
Here's a question I've been pondering lately: How, exactly, does TTL flash metering work? Obviously, the light meter in the camera takes readings "through the lens" and passes that information to the flash. But flash exposure is very dependent on distance. For any given flash output really close objects will be overexposed and very distant objects will be underexposed, while objects some distance in between will be properly exposed. So what I'm wondering is, how does TTL flash work without the flash having any information about the distance to the objects being illuminated?I have no doubt that it *does* work; I've been getting quite good at outdoor fill flash lately, using either the PZ-1p or MZ-S with an AF400FTZ. I'd just to know why what I'm doing works as well as it does. -- Mark Roberts Photography and writing www.robertstech.com
Outside of a dog, a book is man's best friend.
Inside of a dog, it's too dark to read. --Groucho Marx
