Zenith 12 - Depth of Field Explained

I Depth of Field
The lens is also
provided with a scale
calibrated in meters but
it wilt seldom be
necessary to refer to
this.
This is the depth of field
scale [131 snd works as
follows: —
All lenses when focused
on a given sublect, will
show some objects in
front of and behind that
subject sharply pn focus.
This range of sharpness
is called "Depth of Field"
and varies with different
lenses With any lens
you will find that Depth
of Field is always
greater at small lens
apertures, such as f/16.
and less at targe
apertures such as f/2.
Depth of Field is also
greater with a more
distant subject than a
nearby subject and
increases nearly twice
as much beyond the
subject than m front of it.
To use the depth of field
scale first focus on your
subject then determine
how great a Depth of
Field a given aperture
will give by reading
distances against the
two marks for that
aperture. The figure on
the left will be the
nearest point in focus
and that to the right the
furthest, thus enabling
you to select that
aperture which will give
the desired Depth of
Field.
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