Mamiya M645 - Names and Functions of Parts (3); Aperture ring

A.M.
Lever
Automatic
diaphragm
operation
when
"A"
appears
in
the window.
Diaphragm
stopped
down
to
preselected
aperture
when
"M"
appears
in
window.
Focusing
ring
Distance
scale
Depth-of-field
scale
Alignment
dot
Align
with
matching
alignment
dot
on
camera
body
for rapid
lens
mounting.
Aperture
ring
Exposure
meter
coupler
Couples
the
aperture
ring
to
any
prism
finder
with
built-in
meter.
10
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