Figure 2-18.
Size of image in relation to focal length.
b. The focal length of the lens most frequently used with a particular
camera should be approximately the same length as the diagonal measurement of
the negative size. Use of the correct lens causes the proportions of objects
to be recorded as normal. Table 2-3 indicates the diagonal measurement of the
more common negative sizes.
Table 2-3.
Diagonals of negatives.
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