Focal Distance (3 Megapixel) - Microscan MINI Hawk User Manual

Focal Distance (3 Megapixel)

Definition: This setting provides a means for configuring the focal distance of the
imager. The input value is in terms of inches and is divided by 100 internally.
For example, 400 sets the imager to a focal distance of 4 inches. It is
important to note that the imager may not have an exact match for the
focal position requested. The imager has a range of steps that are calibrated
and mapped to focal positions. This input value is matched to the closest
focal position step that the system supports. It is also important to keep in
mind that the resolution of the system is not linear. As the imager's focal
distance setting increases, the resolution decreases. This effect is offset
somewhat by the fact that the depth of field increases at greater focal
distances.
Serial Cmd: <K525,focal
Default: Standard Density = 400 (4")
Options: 200 (2") to 600 (6")
Default: Micro Density = 300 (3")
Options: 200 (2") to 500 (5")
Note: In the factory, the imager calibrates its focus curve and matches the focus motor
steps to various focal positions. Therefore, each imager has a slightly different focus map
of stepper motor positions vs. focal positions. This allows the user to enter a focal distance
that causes the imager to select the closest stepper motor position required to obtain the
user-defined setting. In this way, there is consistency between imagers for any given focal
distance input.
Note: To view a list of focal distances supported by your imager, use the
MINI Hawk High Performance Imager User's Manual
distance>
Camera and IP Setup
<K526> command.
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