 The camera provides automatic exposure
metering in aperture priority auto-exposure or programmed exposure modes (with AE lock
and +/-2EV exposure compensation) or exposure can be manually set
(with exposure metering still available).Light is metered through a sensor on the front of
the camera body rather than using TTL metering or a sensor inside the
filter ring.This means that manual camera settings ( value or
exposure compensation) must be used to account for light reduction due to any filter fitted.