Moving Image Arts Glossary

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Arc
The camera moves in an arc around the subject.

Atmos
This is background sound that fits the context of the scene, for example birds singing, but that has not necessarily been recorded at the same time as the pictures. It is good practice to record some plain atmos sound when filming outdoors while no-one is speaking, to bridge the gaps you may find when editing (such as planes overhead and microphone handling noises). Sometimes know as 'wildtrack'.