Partial metering, Fine spot metering, Over the vagaries of light – Canon EOS-1 User Manual
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over the vagaries of light.
Partial metering
Partial metering limits selectivity
to the area within the outer (8mm
dia.) circle in the viewfinder, ap
proximately 5.8% of the viewfinder
screen. It can be used effectively
when there is a strong light contrast
between the main subject and the
rest of the scene, such as for photo
graphs with a particularly light or
particularly dark background.
Choose this system if you want to
meter a selected area of the frame
then stipulate the final exposure
using exposure compensation.
Fine spot metering
The most selective of the metering
patterns, fine spot metering reads
only the light within the smaller
circle (5mm dia.) and thus limits the
input value to 2.3% of the screen
surface, allowing very precise read
ings of the key parts of a photo
graphic composition. Metering is
exceptionally precise because the
spot metering sensor is located on
the BASIS sensor itself.