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Manual Program Shift
With
the
OM77AF,
the
photographer
is
free
to
select
a desired aperture or shutter speed with the assur-
ance of a perfect exposure. For instance, when
using a 50 mm F1.8 AF lens, the initial setting of
aperture and shutter speed is in accordance with
the Standard Program (Program chart ). By using
the shift-knob, the photographer is free to shift the
program line by 1/2-stops to reach a desired shutter
speed or aperture. In this way, and with no need of
any physical adjustment, the program can be used
as an aperture or a shutter speed-preferred program,
depending on the photographer's intention.
59
Shutter speed
Aperture