On Wed, 08 May 2002 22:01:21 GMT, "Timothy O'Connor" wrote:

DR wrote:
>"> Assuming that the area of the spot is
>> indicated correctly, and that the sensitivity
>> and shutterspeed/gain/aperture are calibrated
>> correctly, the result will be a middle tone
>> exposure for the spot-read area (anything else
>> is accidental). Since this is rarely the correct
>> exposure, spot metering rarely gives the correct
>> exposure (by definition, without modification
>> that is most easily done on the overall scene
>> rather than at a local part of it...).

>Yes your right about spot metering. Perhaps if you used the spot metering
>on an average grey card or some green grass?

The grey card (of the correct tone) must be aimed
directly back toward the camera for correct exposure;
grass can be used, with compensation, since its
average is about one stop darker than middle grey...
In other words, for casual and quick metering,
spot-metering is neither accurate nor convenient...