Mamiya 645 PRO TL - Manual (Page 24)

Aperture Ring/Stop-down Operation
Set the desired f/stop on the aper-
ture Ring
by aligning the f/number
The effect the set f/stop will have
upon the picture area can be con-
with the red reference dot in the firmed on the Finder Screen.
center of the Scale Ring. The Aper- Move the AM Lever on the lens so
ture Ring has a click stop for each f/ that “M” becomes visible-the lens
stop. In-between settings can also then can be stopped down to the
be used. preselected aperture.
When the AE Finder is used, be
sure to return the A/M lever to “A”
(Auto), after having checked the
effect of the manually set aperture.
The AE finder measures the
required exposure through the
lens at maximum aperture and will
give false results if lever is left in
“M” position.