Free course · Camera foundations · Chapter 3

Focal Length & Framing

Change the lens view and camera distance. Watch the actor and background change. This is a simple teaching illustration, not a camera-accurate lens simulator.

Three cinematic room framings featuring the same actor: a wider view, a closer portrait, and a wider view showing more of the room. — These realistic-looking frames help you picture different compositions. They are illustrative AI images, not a controlled lens test. Use the interactive scene below to study focal length and camera position.

See the shot

Room view, actor, tracking marks, and a planned CG monitor.

Horizontal field of view—

Actor height in frame—

Actual camera distance—

Adjust the setup

What should stay the same?Hold camera position
Change the lens; keep camera distance fixed.Keep actor the same size
Move the camera to match the framing.

Focal length 50 mm

Shorter = wider view. Longer = tighter view.

Camera distance at 50 mm 6.5 m

In matching mode, the demo moves the camera as the focal length changes.

View: WideMode: Fixed position

VFX note: Record lens, focal length, and sensor format when required. If the lens zooms during the shot, tell the VFX supervisor. The demo uses full-frame equivalent focal lengths and does not simulate lens distortion.

Try it: place a CG monitor beside the actor

The room itself helps tell the story. Choose a starting view, then check how much of the room stays in frame.

Pick a view and compare it in both camera modes. More than one lens choice can work; explain your trade-off.

Quick check answers

A shorter focal length usually shows a wider view. At a fixed camera position, a longer focal length makes the subject larger in frame but does not by itself change perspective. When you move the camera to keep subject size the same, the changed camera position changes the perspective relationship.