The frame the camera actually captures — anything outside is dead space for the viewer. Monitors display this boundary; dollies and props must sit perfectly here.
Live Area
What the monitor shows you isn't the whole truth. The cinematographer is constantly working with two spaces simultaneously: what is captured, and everything around it that no one sees. The Live Area is this visible frame — the exact picture section that the lens captures and that the viewer will later see on screen. Everything outside this boundary does not exist for the narrative.
In practical work on set, you need the Live Area to control your positions. The focus puller needs it to know where the focus should be. The dolly operator positions the cart accordingly — there's no point in driving with millimeter precision if the movement won't take place within the frame later. Prop masters place props exactly on the boundary or behind it, depending on whether they are meant to be visible. The boom operator deliberately keeps their microphone outside the Live Area so it doesn't intrude into the shot. With handheld or zoom shots, the Live Area shifts — the entire production process must take this into account.
On set, several tools show you the Live Area: the calibrated monitor image, the viewfinder markings on your camera, and on larger productions, the physical marking on the floor (often with tape). Some monitors offer safe area lines in addition to the actual Live Area — this is important because viewers see different edge areas on different screens (overscan). However, you always work to the true Live Area, not the safe area.
The Live Area is fundamentally different from Depth of Field: it doesn't tell you what is in focus, only what is visible at all. An object can be in focus outside the Live Area — it still doesn't matter because it's not visible. Likewise, something within the Live Area can be out of focus and still be distracting. When lighting, you also need to consider areas outside the Live Area if there are reflectors or flags there that are reflecting back into the visible frame.
Common mistake: Crews think the Live Area is static. But as soon as you can zoom, move, or the focus pull sets a different plane of focus, the psychological frame changes — not formally, but in perception. That's why everyone on set must confirm the current Live Area during rehearsals and not rely on old markings.