24mm Wide

A 24mm holds a person and the room they are standing in without either one losing. That balance is the reason it carries so much location work.

It also builds depth. The gap between a foreground object and a far wall reads as larger than it is, so a shot gains layers without anybody moving the furniture.

The field of view is around 84 degrees on a full frame sensor, which is wide enough to take in a small room from its corner. Perspective stretches toward the frame edges and stays close to normal in the middle.

Depth of field is generous. At a middle aperture a 24mm holds a subject at two metres and a wall at ten metres both acceptably sharp, which is what makes it the lens for a shot with something happening on two planes.

Composition matters more than usual because the frame holds so much. A 24mm with nothing in the foreground reads as empty, so give it a near element to anchor the depth it is building.

Use it for establishing a room, for walk-and-talks that need the setting, and for any shot where the space is part of the information.

Move longer when a face is the subject. At this length a head fills the frame only if the camera is close enough to bend it.

A 35mm is wide enough to show the setting and mild enough that the lens disappears. A 24mm announces itself: the corners stretch and the depth exaggerates.

The check is the frame edge. Put a person there. On a 35mm they look normal. On a 24mm they widen and lean outward.

A face lands in a corner and comes back distorted, which reads as a rendering fault instead of a lens. Keep people near the middle of frame, or say so in the prompt.

The other result is a flat empty room. Ask for something close to the camera, such as a doorway edge, a table or a shoulder, so the wide angle has near and far to work between.