Epilog Laser LEGEND 24EX 6000 Owner's Manual page 165

Section 11: Standard and Optional Machine
2.5 inch
These differences are show in the table below along with recommended uses for the
different focus lenses.
Features
2.0 inch
Focus lenses
Depth of field -
sometimes referred
to as range of focus.
151
1.5 inch
Laser beam
Spot Size
This diagram at left
shows the laser beam as
it passes through the
focus lens and how it
tapers to its optimum
focus point. After it
reaches its optimum
focus point, the beam
begins to expand again.
The diagram below
shows an exaggerated
view of the laser beam
at its optimum focus
point. This is the point
where the beam
achieves its smallest
diameter. Notice that
the beam stays at its
optimum point for a
short distance. This
distance is known as the
depth of field.
Each focus lens
produces a different
spot size and a different
depth of field distance.