Large Format Camera Movements: Tilt, Shift, Rise, Swing and Bellows Factor

A view camera's lens and film are joined by flexible bellows, so each can move independently. These movements let you correct converging verticals, place the plane of focus where you want it and fine-tune composition without moving the camera. Close focusing also stretches the bellows, which costs light and must be corrected with the bellows factor.

The two standards

A view camera has a front standard, holding the lens, and a rear standard, holding the ground glass and film. Movements can be applied to either. As a rule, front movements change focus and framing without changing the shape of things; rear movements change both focus and the shape, or perspective, of the image.

Rise and fall

Rise moves the lens up parallel to the film; fall moves it down. They are the architectural photographer's main tool. Keeping the camera level keeps vertical lines parallel; raising the lens then brings the top of a tall building into the frame without tilting the camera upward, which would make the building lean back.

Shift

Shift moves the lens sideways, the horizontal equivalent of rise. It lets you photograph a mirror or shop window without your own reflection, or square up a building facade while standing off to one side.

Tilt and swing

Tilt angles the lens or film forward or back around a horizontal axis; swing angles it around a vertical axis. Their main job is to change the angle of the plane of sharp focus.

The Scheimpflug principle

Normally the film, the lens and the plane of focus are parallel, so only one distance is sharp. The Scheimpflug principle states that when the film plane, the lens plane and the subject plane all meet at a single line, the whole subject plane is in focus. Tilt the lens forward a few degrees and the plane of focus tips down to lie along the ground, so near flowers and distant mountains can both be sharp at f/16 instead of f/64.

A practical method: focus on a far point, tilt the lens forward until a near point also comes into focus, refocus on the far point, and repeat until both stay sharp. Then stop down for depth of field above and below that tilted plane. See depth of field for how aperture adds the rest.

Rear tilts and swings

Tilting the back also changes the plane of focus, but it changes perspective too: objects nearer the part of the film that moves away from the lens grow larger. Photographers use this deliberately to exaggerate a foreground, or to correct verticals when the camera must be aimed upward.

Image circle and coverage

Every lens projects a circle of usable image, its image circle. On a view camera it must be larger than the film's diagonal to leave room for movements. A 150mm lens designed for 4x5 might have an image circle of 210 to 230mm, against a 4x5 diagonal of about 150mm, leaving generous room for rise and shift. Move too far and the corners darken or go black, which you can see on the ground glass by looking through the clipped corners for the lens's aperture.

Bellows factor

Lens apertures are marked assuming the lens is focused at infinity, one focal length from the film. When you focus closer, the lens moves farther from the film and the light spreads over a bigger area, so the effective aperture is smaller. The correction is the bellows factor:

Bellows factor = (bellows extension ÷ focal length)²

Example: a 150mm lens racked out to 225mm for a close-up. 225 ÷ 150 = 1.5; 1.5² = 2.25. Multiply the metered exposure by 2.25, a little more than one stop. At 300mm extension, life-size reproduction, the factor is 4, two full stops. As a rule of thumb, corrections become significant once extension exceeds the focal length by about a quarter.

Long corrected exposures may then push you into reciprocity failure, which must be added on top.

The ground glass and dark cloth

The image on the ground glass is upside down and reversed, and dim enough that you need a dark cloth over your head to see it. A loupe helps confirm focus. Once composed, close the lens, cock the shutter, insert a film holder, pull the dark slide and expose.