Cleaning optical components
204
Goldeye G/CL Technical Manual V4.1.1
As shown in Figure 67 , contamination (dust, particles, or fluids) on the sensor or
on optical components may 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.
Also, contaminations that are situated on the edge of the lens and/or the filter,
may not be in the field of view, and therefore will not be visible in the image.
Do not confuse a contamination with a pixel defect, which appears as a distinct
point. Particles can either rest loosely or can be stuck to the optical surface.
Where is the contamination? — Locating
contaminations
Before dismounting the lens, you should determine whether the contamination is
situated on the filter, lens, or sensor. To do so, capture a uniform image (e.g., a
white sheet of paper) with the camera. The affected optical surface is identified
when optical component in question is moved (rotated) and the dirt follows this
movement.
•
If you rotate only the lens (not the camera) and the contamination moves as
well, the contamination is on the lens.
•
If you move the filter or protection glass window and the contamination moves
as well, the contamination is on the filter or protection glass.
•
If the contamination is neither on the lens nor the filter or protection glass, it is
probably on the sensor.
Figure 67: Examples for the appearance of dust on the filter (left and middle), and
the sensor (right)
