38 DataMan 300 Quick Reference Guide
DataMan 300 Quick Reference Guide 39
target does not completely fill the image, make sure that there are no high-
contrast features visible outside of the target (see previous bullet).
Setting Focus (Continued)
Perform the following steps to use
Focus Feedback
:
1. Connect the reader to the Setup Tool.
2. On the Results Display pane, check the Focus Feedback option and enable
Live Display.
3. The Focus Feedback column is displayed in colors ranging from red (bad
focus) through yellow to green (sharp focus).
Position the reader in a way that the focus column becomes green. The
maximum focus peak gets locked for better orientation. When the focus
column is green, the lens is in focus and you will be able to decode the image.
For the C-mount (or other non-Cognex) S-Mount lenses, the lens’s focal
length, focus setting, and aperture setting determine the field of view
and reading distance.
Field of View and Reading Distances
The following maps show the field of view of the DataMan 300 series
readers. Reading distance values are also provided for 1-D and 2-D
example code distances.
Notes:
If you are using the focus feedback indicator to adjust a manual focus lens,
you must apply power to the reader before you remove the cover. If you
remove the cover before applying power, the internal illumination will not
function.
If you are using a Liquid Lens, make sure that the cover is mounted and
connected before you apply power. If you attach or remove the front cover
while the reader is powered, the focus settings will be lost.
