On Aug 2, 2005, at 3:54 AM, Tom Reese wrote:
It's a principle driven by basic reflective meter response
calibration. Remember that a reflected light meter believes that
ANYTHING in front of it is an 18% gray average target. Makes no
difference whether you're metering for a sensor or a piece of
film, b&w or color.
Of course, some adjustment to how much you alter the exposure
based upon what the particular film/sensor response curve happens
to be is appropriate...
This all works very well when spot metering faces. Exposure
adjustment when using multi-segmented metering is a crapshoot at best.
I agree it's easiest to learn meter responses when you have a simple
meter with a known metering pattern. This is why I often use CW
Averaging meter pattern in my work.
Multi-segmented metering applies logic to "correct" exposure
evaluation in addition to the meter's basic response pattern. BUT,
like with anything else, after a bit of use and experience you come
to understand the metering systems response pattern and can apply
your own corrections when you know it will not respond adequately to
produce a good result. I use the EV Compensation control quite a bit
on multi-segment evaluative metering mode too.
Godfrey
