ALLIED Vision Technologies Manta G-917 - Manual (Page 19)

Manta Technical Manual V7.0.1
19
Camera cleaning instructions
Is it an impurity? – Identifying impurities
If you observe any image artefacts in your video preview of your Manta camera
you may have impurities either on the lens, filter/protection glass or, on the
sensor protection glass. Every Manta camera gets cleaned prior to sealing and
shipment; however, impurities may develop due to handling or unclean envi-
ronments.
As shown in figure 2, impurities (dust, particles or fluids) on the sensor or
optical components appear as a dark area, patch or spot on the image and
remain fixed in the preview window while you rotate the camera over the target.
Do not confuse this with a pixel defect which appears as a distinct point. Parti-
cles can either rest loosely or can be more or less stuck to the optical surface.
Where is the impurity? – Locating impurities
Before you dismount the lens you should find out if the impurity is on the filter,
lens or sensor. Therefore, you should capture a uniform image (e.g. a white
sheet of paper) with the camera. The affected optical surface is identified when
a suspected optical component is moved and the dirt follows this movement.
1. If you move only the lens (not the camera) and the impurity moves as
well, the impurity is on the lens.
2. If you move the IR cut filter/protection glass window and the impurity
moves as well:
Please carefully remove the filter/protection glass and clean it on both
sides using the techniques explained below.
Figure 2: Image with tiny dust on the filter (left) and dust on the sensor (right)
Note

• Taking out the filter requires special care.
• Ask your dealer to help you if you are not
confident with the procedure.