Nikon D200 - Manual (Page 35)

b6 Center-Weighted sets the diameter of the center weighted circle. These settings
only take effect when you've selected center weighted metering.
I never use center weighted metering, so I certainly never play with this.
You also have the option of metering from the entire image, called "Average."
These modes went out in 1986 when the Matrix Meter was invented. I always use Matrix.
b7 Fine Tune Exposure Don't do this!
This is a service adjustment that allows you to make semi-permanent tweaks to the
exposure meter calibrations. These settings do not show up on the control panels!
Don't do this. If your shots are too dark or light you should have your camera repaired, or
use the regular
Exposure Compensation button.
CUSTOM SETTING MENU
c1 - c5: TIMERS/AE&AF LOCK
How to Get Here
Press MENU, go to the left and select the pencil icon. You'll then see CUSTOM SETTING
MENU on the color LCD. Click down to c TIMERS/AE&AF LOCK and click to the right.
What it Does
AF and AE lock are important to getting perfect files straight from the D200 without editing
in rare instances where the lighting might confuse the Matrix meter. If you're using them a
lot you're probably doing something wrong and should fix your lighting.
Timers optimize battery life vs. convenience.
What I Change
I change all of them except c1. I leave c1 at default.
c1 AE Lock lets you lock the exposure with the shutter button, like a point-and-shoot
camera. You don't want that, so leave this one alone.
The D200 has a dedicated AE Lock button. You don't want the shutter button to lock
exposure.
AE normally only locks if you hit the AE-L button explained next.
PDF by Paul Deakin - 35 - © 2006 KenRockwell.com