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This camera provides two metering methods: "TTL Actual
Aperture Metering" (centre-weighted light measurement) that
measures the reflected light on the shutter curtain, and "External
Light Metering" that makes measurement with the light sensor
beside the viewfinder. While the external light metering is used
for the Hologon T* 16mm F8, measurement is performed on
TTL actual aperture metering with other lenses. The metering
method switches automatically when the lens is mounted.
When the Data Back GD-2 is used, the "estimated F-number"
in "Exposure data" is indicated as an approx. value that was
calculated by measuring the brightness on external metering.
Be sure that your fingers do not obstruct or rest on the external
metering window.
METERING SYSTEM