Section 5.1.1.7, Resolving Power Target:
"The resolving power target used on all tests shall be as follows: Thetarget shall consist of a series of patterns decreasing in size as the
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, with a range sufficient to cover the requirements of the lens-filmcombination under test. The standard target element shall consist oftwo patterns (two sets of lines) at right angles to each other. Eachpattern shall consist of three lines separated by spaces of equalwidth. Each line shall be five times as long as it is wide."
"The target contrast (the difference in photographic density betweenthe lines and spaces) shall be either high, medium, or low contrast, asspecified."
"High contrast target. A high contrast target is one in which thedensity difference between the light and dark areas is greater than2.00."
"Medium contrast target. A medium contrast target is one in which thedensity difference between the light and dark areas is equal to 0.80 ±0.05."
"Low contrast target. A low contrast target is one in which thedensity difference between the light and dark areas is equal to 0.20 ±0.05."
The combination of a single black bar and a single white bar, withcombined size 1/x as shown in Figure 1, is known as a cycle.Resolutions are often specified in cycles/millimeter. Since one cyclecontains a single (black) line, lines per millimeter and cycles permillimeter are numerically the same.
