18.
It is the total distance from the subject to the focal plane, (para 2-
14a).
19.
One distance increases as the other decreases or visa versa, (para 2-
14b).
20.
a.
I
S=O
b.
ID = FL x (S + 1).
c.
ID
OD = S
(para 2-14c(1)(2)(3)).
21.
Move the ground glass farther away from the lens, (para 2-15a).
22.
The ability to reproduce fine lines, (para 2-16a).
23.
Normally two to two and a half stops above the maximum aperture of the
lens, (para 2-16c).
24.
It is the distance from the nearest point of acceptable sharp focus, to
the farthest point of acceptable sharp focus of a subject being
photographed, (para 2-17a).
25.
By focusing on a point one-third of the distance between the nearest and
farthest point of focus, (para 2-18).
26.
The distance the focal plane can be moved forward and backward from the
point of exact focus and still retain an image of acceptable sharpness,
(para 2-19).
27.
Setting
Depth
of field
f/4.5
13 to
18 ft.
f/5.6
12 to
21 ft.
f/8
11 to
24j ft.
f/11
10 to
28 ft.
f/16
91 to
35 ft.
f/22
9 to
47 ft.
f/32,
7 to
INF., (para 2-20).
28.
1:2, (para 2-24b).
29.
6x10-inches, (para 2-24c).
30.
4, (para 2-25a).
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