Canon QL FT - Page 34

Depth-of-Field Scale
The depth·of·field scale indicates the range of
subjects which will be in focus sharply on the
film. This range will vary with the following
factors : The depth·of · field will be deeper the
smaller the aperture opening, the further the
distance of the subject, and/ or the shorter the
lens focal length. The depth·of · field will be
shallower the larger the aperture opening, the
nearer the distance of the subject, and/ or the
longer the lens focal length .
34
t /8 50mm
Depth·ot·field 2.3m-4 .3m 18 ' -14' )
Foc used at 3m 1 10 ')
o
For example, if the lens used is 50mm and
the subject has been focused at a distance of
3m (10'). with an f/ 8 aperture value read off
from both indexes on either side of the indicator
(orange line). the depth · of · field is from approxi ·
mately 2. 3m (8') to 4.3m (14').