the chart is 64,800
accurately, a multi-finger divider should be used (fig.
on the divider. This will give you the total flight-line
plot width. Using a ruler, place the first divider finger
on zero and the last divider finger on the mark
corresponding to the total flight-line plot width. The
individual fingers of the divider automatically space
themselves to the correct distance for each flight line.
frequency between frames. The conversion factor for
Advanced Photography Course