The
PZ-1p incorporates an eight-segment matrix TTL metering system. Exposure
values in eight defferent zones within the image field are independently
measured. The camera thereafter calculates an optimal exposure based on an
algorithm stored in the camera's computer. With conventional averaged metering
systems, underexposure of the subject ordinarily results from a bright
background due to its greater influence on the meter. With multi(8)-segment
matrix metering, the camera chooses an exposure that will not underexpose the
subject. The multi(8)-segment metering system also automatically compensates
for high-contrast and other difficult lighting conditions.
Spot
metering takes its measurement only from the small area in the center of the
viewfinder. This mode is best used in conjunction with the PZ-1p's Memory Lock
function.
I always use
bottom/center-weighted metering or spot metering because they're more
predictable. It is easier to determine when to deliberately increase or
decrease exposure. Multi-segment matrix metering occasionally over-exposes
specially when using Pentax-M lenses. This may be due to the absence of
information contacts on Pentax-M lenses. The camera is not provided with all
the information it needs, such as aperture and focus distance. At any rate, no
metering system is fool-proof. It is best to assume some control over
exposure.
Bottom/center-weighted metering does not automatically compensate for backlit situations, unlike multi(8)-segment matrix metering. As shown in the illustration, the central part has greater influence on the over-all metering. Also, the lower part of the image has greater influence than the upper part.