Motion Blur

Motion blur is the apparent streaking of rapidly moving objects in a still image or a sequence of images such as a movie or animation. It results when the image being recorded changes during the recording of a single exposure, either due to rapid movement or long exposure.

In televised sports, where conventional cameras expose pictures 25 or 30 times per second, motion blur can be inconvenient because it obscures the exact position of a projectile or athlete in slow motion. This can lead to more perceived motion blurring above and beyond the pre-existing motion blur in the video material. See display motion blur. Sometimes, motion blur can be removed from images with the help of deconvolution. In video games the use or not of motion blur is somewhat controversial. Some gamers claim that the blur actually makes gaming worse since it does blur images, making more difficult to recognize objects, especially in fast-paced moments. This does become noticeable the lower the frame rate is.

How do you blur the background in your photo in the camera?

1. Open the aperture more for a shallow depth of field.

Use a wider aperture (thats the opening in your lens) by choosing a smaller f number on your camera’s settings. This will cause less of the scene to be in sharp focus, something we call a shallow depth of field. The reason why a wider aperture results in more background blur, and a thinner area of focus can be explained by a scattering effect. Think of a garden hose, with the nozzle almost closed, producing a thin jet of water. Since the water does not spread very much, over distance, the water’s spray does not change very much. Now the same hose and water, with a wider, more open nozzle – the water sprays out, and the further it travels, the wider and softer the spray. Light travels in a similar way. A wide aperture allows the light entering to spread much more, causing a scatter effect from any light that is from out of the focus zone. The wider the aperture, the more this scatter occurs.

2. Use a longer focal length to blur the background more.

Zoom in more, or use a longer lens. The more zoomed in you are, the more shallow the depth of field. It’ll also compress the scene, making distant objects appear to be closer, but more blurred out. An oversimplified explanation – By zooming in, the actual depth of field doesn’t change, but the angle of view is much smaller, meaning you’ll only capture a smaller area of background. With a smaller angle of view, the rays of light entering the camera are more parallel, and less focused.

3. Get closer to the subject for that macro effect.

By getting closer to the point of focus you’ll move the focus area closer, and throw the background more out of focus. This is how macro lenses work.

4. Combine these tips for maximum blur.

Choosing a wider aperture, and a longer lens, then getting really close to the details, you’ll get maximum blur and really restrict focus to the area you want the attention to be on.