Adjust the focus and aperture
- Gisela Roberts
- Andy Roberts (Deactivated)
- Ben Stanley
While you are positioning the cameras and checking that they give coverage of the whole volume (see Check the coverage of the capture volume), to achieve a good marker image you may need to adjust the camera lens. Depending on your Vicon camera model, you may find two or three adjustment rings on the lens. These control the focus and aperture, and if the camera has an additional ring, the focal length (zoom).
Vicon Valkyrie:
Vicon Vero:
Vicon Vantage:
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For Vantage cameras, for 8.5 and 12.5 mm lenses, the order of the aperture and focus rings is the reverse of that shown. |
Vicon Vue:
Vicon Viper:
Vicon ViperX:>
Important
- T-Series cameras: Use with Shogun 1.9 and later is not supported or tested and is at your own risk. For information on using these cameras, see the documentation for versions of Shogun earlier than 1.9.
- Bonita cameras: Use with Shogun 1.10 and later is not supported or tested and is at your own risk. For information on using these cameras, see the documentation for versions of Shogun earlier than 1.10.
To focus a camera:
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To make focusing easier, in the View Filters, go to the 2D Data options and select Maximize Grayscale, which zooms the view into any visible markers.
- Fully open the Aperture ring.
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Adjust the Focus ring so that the markers become round and clear. As you rotate the focus ring, notice the marker images get smaller and then at some point will begin to get larger again. Good focus is when the marker is at its smallest size. Leaving this setting at infinity ∞ is normally suitable. Aim for a marker image similar to the following:
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Close the Aperture ring so that as much background noise as possible is removed without compromising the quality of the marker image. Try to obtain good, clear images of markers even when they are close together, as shown in the following image, where the markers on the left are touching. The markers should not be too small, and the center should be just off-white (not fully saturated) when viewed from the middle of the volume.
