The video equivalent of the image-enhancement stills photographers carry out on their images. Videographers ‘grade’ video to match the colours and exposures between clips, to create a certain ‘look’ or to edit video shot in a ‘log’ mode for extra dynamic range.
Also known as battery grips, these are accessories that attach to the bottom of some DSLRs or mirrorless cameras to offer extended battery life and, usually, a duplicate set of controls to make the camera suitable for extended use in portrait (vertical) mode. In some cases, a battery grip may also increase the continuous shooting speed of the camera. For example, the battery grip of the Nikon D850 increases its continuous shooting speed from 7fps to 9fps.
An advanced kind of electronic shutter that can capture the entire image area at once, instead of scanning it strip by strip. This should eliminate the rolling shutter effect usually associated with electronic shutters and make them much more effective for capturing moving subjects. It does, however, require advanced sensor technology, especially in larger sensor sizes, and powerful image processing, which is why it’s still in its infancy in the mass market.
Camera lenses used complex configurations of different optical elements, often cemented or fixed together in ‘groups’. Lens groups may be designed to counteract common optical aberrations and you may have autofocus ‘groups’ and zoom groups. Lens elements and groups often move relative to each other in complex ways as the focus and zoom settings are changed.
See also: Lens explained
Gain is a term you’re likely to meet in video rather than stills photography. It basically means turning up the input signal strength to record a decent value. Videographers are more likely to talk about increasing the ISO setting rather than the ‘gain’, though it amounts to the same thing. It’s still used for audio recording, where your camera or sound recorder will probably have a ‘gain control’ or some kind of ‘AGC’ – automatic gain control.