Adjusting The Camera Position And Image Magnification - CellScale BioTester User Manual

Adjusting the Camera Position and Image Magnification

The horizontal camera position can be adjusted using the knobs at the back and side of the
camera housing. If larger position adjustments are needed, the camera mast can be rotated to
allow alignment of the camera image with the testing axes.
The BioTester comes equipped with a 10X zoom lens as shown below. Other versions of the
BioTester may be equipped with a fixed magnification 75mm focal length lens (see Appendix E).
The image magnification can be changed by rotating the adjustable rings found on the lens. Once
the rings are adjusted to the desired settings, they can be locked using thumb screws. Adjusting
the three rings has the following effect:
1. The iris ring changes the
brightness of the image. It is
recommended to leave this
ring fully open and control
image brightness by adjusting
the camera shutter and gain in
the Camera tab of the
Hardware Settings.
2. The W – T ring changes the
lens zoom.
3. The F – N ring changes the
lens focus.
Using this lens, it is possible to achieve a wide ranging field of view as shown in the graph below.
Possible values for field of view are shown by the shaded gray region of this graph and can range
from 5.5mm to 24mm. To adjust the working distance (vertical position of the lens and camera
assembly), loosen the fasteners that clamp the camera housing to the mast and raise or lower the
camera then retighten the fasteners. The ideal working distance from the specimen to the lens is
15cm. It is not recommended to have the lens any closer than this.
If the camera position or magnification is changed, it may be useful to capture a single image
scale shot. A glass calibration target or a ruler is acceptable for this purpose. The scale shot will
be useful later to characterize the size of test specimens or test specimen features.
Iris Ring
W-T Ring
F-N Ring
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