Table of Contents
Advertisement
The distance scale
The distance scale (17) indicates the
distance on which the lens is set. and,
in connection with the depth-of-field
scale (16), the extent of the depth of
field. The distance is also important to
the calculation of the guide number for
flash equipment.
The aperture scale
The aperture scale is internationally laid
down; the values have been chosen so
that the quantity of light reaching the
film is halved every time the lens is
stopped down one step. One aperture
step is equivalent to one step on the
shutter speed dial (2) regarding the ad-
justment of the
light
quantity to which
the
film
is exposed
.
.
Like the shutter speed dial, the lens
diaphragm ring clicks into position op-
posite each number (some diaphragm
rings also at half values). This will en-
able you, after some practice, to identify
the setting of the diaphragm even
in
the
19045-110
dark.
20
Advertisement
Table of Contents
