Canon FT - Depth-of-Field Scale Explained

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_
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
approximately 2. 3m (8') to 4. 3m (14 ' ).
If the aperture is closed down to f/ 16, the picture will be:
come sharp between 1.9m (6') to 7.6m (25') from the
camera. This range will vary with the f/ stop selected_
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50 m m Le ns f / 8
Depth-of-field 2.3- 4.3m (8' - 14 ')
Focused at 3m (10' )
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5 0mm Le ns f/ 16
Depth-of-field 1.9m - 7.6m (6 '- 25')
Focused at 3m ( 10')