Motion blur

When motion blur is used in photography a blur in images of moving objects, which do not arise due to incorrect focusing, iris adjustment or other operating and setting error of the photographer. It is obtained solely by a noticeable during the exposure time of movement of the subject and increases in proportion to the exposure time and the angular velocity of the object relative to the camera.

This effect is often undesirable. Because the photochemical emulsions in the 19th century were relatively insensitive to light even and long exposure time needed, had to persons, animals or otherwise mobile objects resting several seconds to be in focus.

The terms motion blur and other blur are often confused. In the majority of shooting situations - such as macro photography - motion blur is undesirable in sports photography but it is partially used to generate momentum in the image. In most cases unintentional camera shake, however, the entire image is out of focus, this is only from a technical point of view, motion blur.

Entrainment

The camera is pulled along as synchronously as possible in the direction of movement with a motive. In this case, the surrounding areas may be blurred when a sufficiently long exposure time is chosen. However, this must be short enough to still sharp and select the main object - without camera shake - map. Unless it is photographed with flash, with different effects ( strobe, 2nd curtain, etc.) can be achieved with it.

Blur with longer exposure time

Holding the camera still or with a tripod, the targeted use of motion blur is possible. This exposure time is chosen in which the desired image elements appear blurred, while the rest of the main subject is in focus, eg the flow of traffic, watching the fireworks or the waterfall.

Technical Background

The main influence on the motion blur here have the relative velocity of the moving object in conjunction with the exposure time; by a faster shutter speed motion blur can be reduced, but not in all cases be entirely avoided. The "freezing " of movement is determined by the motif sometimes only possible with high-speed cameras or other techniques.

Synthetic motion blur

In the image processing, the effect of motion blur is important. Frequently, in order to give a touch of motion pictures. Therefore, there is in most modern image editing programs synthetic motion blur effects that are caused by filters such as can cause the blur.

In computer games and animation ( computer generated movies) motion blur is used to make movements more realistic.