Long Range Mount Installation
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2005-2010 SR Research Ltd.
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position) for binocular (or monocular) recording. In addition to being tilted up or down, the
Illuminator can be swiveled around its vertical axis to assist with positioning. Several lenses
are available for optimal tracking at different eye-to-camera distances. Three lenses (75, 50 and
35 mm) and a tripod adapter are pictured (see Figure 7-1 right).
The most important step in setting up the mount is to align the
illuminator so that it is maximally illuminating the camera’s view.
Doing this alignment ensures that no matter where the camera is
pointed, it’s target will be lit with infrared light as long as there are no
obstacles in the way.
7.2
Overview of Setting the Mount
The most important step in setting up the long range mount is to align the illuminator so that
it maximally illuminates the location that the camera is pointing. Once this is done, the
Camera Head and Illuminator are tightened in place and the entire Mounting Bar can be easily
positioned using the ball joint on the Mount or the lever of the tripod to which it is affixed.
Aligning the Camera Head and Illuminator ensures that no matter where the camera is
pointed, its target will be lit with infrared light without requiring time-consuming adjustment of
the components.
Loosening the knob on the back of the Illuminator clip allows heading position and tilt of the
Illuminator to be adjusted. Loosening the knob on the Camera Head clip allows lateral
positioning of the Camera Head by sliding it along the Mounting Bar, and allows the angle of
the Camera Head to be rotated 45 degrees for binocular recording when an illuminated view of
both eyes can be acquired.
The long range mount is designed so that the side of the Illuminator and Camera Head are
interchangeable. Cables coming from the Camera Head should be directed so they can exit and
be securely fastened to avoid being crimped. Typically, the Camera Head and Illuminator are
located at opposite ends of the Mounting Bar, and the cables will emerge from the center.
For monocular recording, the typical position for the Illuminator will be on the same side of the
Mounting Bar as the eye-to-be-tracked, with the Camera Head on the opposite side. This
ordering may not be necessary, but can help in environments where blockage of the illuminator
can occur. The most important factor in positioning the Camera Head and Illuminator is that
there is an unobstructed line of sight from the camera to these components. Given these
recommendations, the configuration in Figure 7-1 depicts the ideal positioning for tracking a
participant’s right eye (left eye if viewed through a mirror as in many MRI setups).
