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4.4. Adjust focus
If focus adjustment is needed, the lens caps of the left and right cameras must be removed as shown in
Fig. 4.2: Removing of lens caps for re-focussing and changing aperture
The focus ring and the aperture ring are locked by 3 screws for each ring as shown in
. All three
screws must be loosened for moving the ring.
Fig. 4.3: Location of screws for focus and aperture ring
For setting the focus correctly, the calibration grid should be placed in the middle of the working range. Then,
the focus ring should be turned until the bars in the images become a minimum. After focusing in this way,
the grid should be placed at the minimum and maximum working distance. If the blur is unsatisfactory at the
minimum and maximum working distance (e.g. near the second dividing line or higher), the aperture can be
closed a bit, i.e. choosing a higher aperture number. Please be aware that this increases exposure time and
potentially gain, which increases noise in the image. The optimal tradeoff is application dependent.
MATRIX VISION GmbH
Manual: BVS 3D-RV1
20
Rev: 1.0
Status: Nov 14, 2022