Deforum's 3D FOV scales how fast translation_z moves the canvas, with defined edge cases at 0, 180 and negative values

In Deforum 3D mode, translation_z moves the canvas toward or away from the viewer, but the perceptual speed of that movement is scaled by fov_schedule (range -180 to +180), following an inverse-square curve. A smaller FOV (e.g. the default 30) makes Z-motion feel faster and more dramatic; a larger FOV (e.g. 100) makes the same translation_z produce slower, smoother movement. FOV of 0 is undefined and produces a blank image; FOV of 180 flattens the canvas into the view plane, eliminating Z-motion; negative FOV inverts the Z direction. The depth warping itself is computed by MiDaS and AdaBins depth models inferring depth from each generated image.

Examples

translation_z 0:(1.5) with fov 30 = fast zoom-in; the same translation_z with fov 100 = gentle slow push. A landscape prompt benefits from lower FOV for dramatic movement; a close-up portrait from higher FOV for a subtle push.

Assessment

If translation_z is set to 2.0, describe the visual difference between fov=30 and fov=100, and explain what fov=0 or fov=180 would produce.