Closing The Aperture - Beckhoff VOS2000-0822 Manual

Use
Refocus
The set focus may be lost in the event of major temperature changes.
• Adjust the focus manually again.
Loss of contrast and sharpness
Inaccurate focusing can cause both contrast and sharpness to be lost. This can affect the imaging
performance of the system.
• Set the focus as precisely as possible.
Exception: Distracting object features or structures should be suppressed in favor of homoge-
nization through blurring.
Focusing with open aperture
At open aperture, the depth of field decreases. Therefore, the focus can best be adjusted with the
aperture wide open. After that, the aperture can be closed more again.
• Open the aperture and adjust the focus.
5.2

Closing the aperture

The aperture can be opened or closed with the aperture ring. The aperture ring can be loosened or locked
via the locking screw.
You can choose between f-numbers 2,2 and 16. The smaller the f-number, the larger the aperture.
Conversely, the higher the f-number, the smaller the aperture. Thus, the largest aperture is achieved with the
smallest f-number and the smallest aperture with the highest f-number.
The wider the aperture opening, the brighter the image and the smaller the depth of field. Smaller f-numbers
reduce the depth of field.
ü An M3 Allen key is required for the locking screw. The recommended torque for M3 screws is 50 N * cm.
1. Loosen the locking screw for the aperture ring using an M3 Allen key.
Fig. 10: Loosen aperture screw
2. To adjust the aperture, turn the aperture ring. If you turn the aperture ring clockwise as seen from the
camera, the aperture becomes larger and the image brighter. If you turn counterclockwise, the aperture
becomes smaller and the image darker.
20 Version: 1.0 VOS2000-0822