7.1 Secondary Camera

Every NRAO video conferencing system is equipped with a secondary camera that is optically identical to the main camera, but whose remote control provides a slightly different selection of operations.

This remote allows use of only six preset camera pan/zoom positions, but does allow you also to store a backlight compensation setting as part of each camera preset. Backlight compensation lets you balance the visibility of the images on the projector screen relative to those of people in the room when someone is making a presentation using an overhead projector. (Backlight compensation is also available for the main camera, but it can be set only globally within the Polycom ViewStation, not separately for each camera preset.)

The ability to store a backlight compensation setting with each preset gives the secondary camera a big advantage over the main camera when covering presentations that use the overhead or LCD projectors,

The control for the secondary camera has two zoom speeds and finer camera panning.

Presets for the secondary camera are set by pushing the PRESET button and the desired preset number simultaneously on its remote control, and then invoked by pressing only the numbered buttons. There is no ViewStation menu on the TV monitor for the secondary camera.

Presets for the secondary camera will be lost if power is completely disconnected from this camera, but not if it is turned off/on using the POWER button on its remote control.

The remote control for the secondary camera must be pointed towards the camera more precisely than remote control for the main camera, so it is important that the secondary camera operator have a clear view of the camera.

The focus of the secondary camera can also be adjusted manually from its remote control using the FOCUS button, but this feature should rarely be needed.

**Table 2:** Pros and cons of secondary camera
Advantage	Disadvantage
Backlight compensation	Second remote needed
Finer pan/zoom control	Remote more directional
Manual focus possible	No audio tracking
Second camera angle	Fewer presets