Intentional camera movement
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In intentional camera movement (ICM), a camera is moved during the exposure for a creative or artistic effect. This causes the image points to move across the recording medium, producing an apparent streaking in the resulting image.
The process involves the selection of an aperture and the use of filters to achieve a suitable shutter speed. Proponents experiment both with the duration of the exposure and the direction and amount of camera movement while the shutter is open. Generally exposures of 1/20 to 1/2 second give the best results and an optimum seems to be 1/8th of a second. The effect depends significantly on the direction that the camera is moved in relation to the subject as well as the speed of the movement.
If light levels are high the use of neutral density filters will reduce the light entering the lens, thus enabling the exposure to be extended. A polarising filter can also be fitted to the lens. This has a dual effect of reducing reflections within the image and reducing the light by about two stops. Photographers set the camera's ISO setting to the lowest available on the camera (commonly 100), as this reduces the camera's sensitivity to light and so gives the slowest possible shutter speed.
The direction of movement of the lens has a dramatic effect on the results. Patience is required along with much experimentation to establish where and how to move the camera to achieve the desired effect. The camera can be moved upwards, downwards, to the right or left or away from or towards the subject while being handheld. The camera may also be turned, angled, and rapidly moved back and forth.
Relation to motion blur
In a sense, ICM is the same effect as (intentional) single-exposition motion blur: in the former the camera moves during exposure, in the second the target moves, but they have in common that there is relative motion between camera and target, resulting in streaking in the image.
A special case occurs when the camera is moved during exposure while keeping it pointed at a moving target, so as to hold its projection on the recoding medium steady. The stationary environment (usually mainly background, but possibly also some foreground) then is subjected to ICM and appears streaked in the final image.
Another special case is that of forward (or backwards) camera movement, typically with the camera focused on the distance. The streaks in the resulting image converge on the central point, giving a suggestion as if it is at the end of a long tunnel.
- Juergen Roth, "The fine art of intentional camera movement", Where in the world is Juergen Roth?, 13 July 2011.
- Fairchield, Douglas (October 24, 2008). "Kickin it New School" (PDF). Santa Fe New Mexican. Retrieved 2013-02-17.
- Gabriel Bauret, "Fragments of the discourse on a photographic oeuvre." Alexey Titarenko: Photographs / Gabriel Bauret: Essay (Washington D.C.: Nailya Alexander, 2003; ISBN 0-9743991-0-8), page 40.
- Angela Faris Belt, The Elements of Photography: Understanding and Creating Sophisticated Images (Oxford: Elsevier, 2008; ISBN 978-0-240-80942-7), pp 200-205.
- Sekiji Kazuko (関次和子), "Tanaka Kōtarō" (田中幸太郎), in Nihon shashinka jiten (日本写真家事典) / 328 Outstanding Japanese Photographers (Kyoto: Tankōsha, 2000; ISBN 4-473-01750-8), p.201. Despite the English-language alternative title, all in Japanese.
- Intentional Camera Movement Group at Flickr