Lighting
Lighting should be controllable so that it is not too dim for camera work.
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Camera sensors have a limited ability to see both highlights and shadows at the same time (known as the dynamic range of the sensor), and so diffused, even lighting is highly beneficial.
Many cameras will auto-adjust to low light but in doing so, the video noise (dancing dots) may be increased. If the projector screen is being filmed (or even partly in shot), then the camera may automatically adjust exposure for the brightness of the screen, and if the rest of the stage area is not correctly lit it may appear too dark in the video.
Over-reliance on spotlights can create harsh shadows which can be unflattering to the presenter. Similarly, the use of board lights on blackboards and whiteboards can create areas of extreme brightness and shadow that the camera is not well equipped to deal with. Whiteboards in particular are prone to reflections of spotlights and board lights, creating a halo effect that can make writing unreadable not only on the video, but also for a live audience.
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