Dalsa Genie Nano-CXP Series, User Manual

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Operational Reference Genie Nano-CXP Series™
Notes about Lens Shading Calibration
Note: It is recommended that the “Lens Shading Calibration” procedure be done for every
Nano-CXP/Lens combination. Calibration will eliminated any lens vignetting in the image corners or
any other shading differences across the image field. Calibration will allow using a lens with a
slightly smaller image circle that doesn’t quite evenly expose the whole sensor. The graphic below
shows how a lens used on the 16M model could be used with a 25M model after shading calibration
(results will vary with different lenses).
26.2mm minimum
Image Circle
32.6mm minimum
Image Circle
Model 4095
Model 5105
CamExpert allows quick calibration by the user. The features for the Lens Shading Correction Group
can also be accessed by the user designed application. The feature descriptions are shown below
and after calibration the data should be saved in a user set.
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Lens Shading Correction Calibration Dark: Perform a dark calibration for lens shading
correction. Typically done before the bright calibration, this calibration requires a dark
acquisition (as little light on the sensor as possible).
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Lens Shading Correction Calibration Bright: Perform a bright calibration for lens shading
correction. This calibration requires a bright featureless acquisition that is not saturated. (70%
illumination is recommended).