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In physics, motion is the phenomenon in which an object changes its position over time. Motion is mathematically described in terms of displacementdistancevelocityaccelerationspeed, and time. The motion of a body is observed by attaching a frame of reference to an observer and measuring the change in position of the body relative to that frame.

https://en.wikipedia.org/wiki/Motion

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

https://en.wikipedia.org/wiki/Motion_blur

Capturing (or creating)  the effect of motion and or blur, is something that occurs to most photographers in their pursuits. It can be achieved by technical skill, understanding the relationships between aperture and shutter speed. It can also be achieved by digital effects in Apps like Photoshop. I use both methods.

The end results can be very interesting and I in particular really do like these types of image. You may capture and freeze a singular moment in time and by using motion and blur give that moment some meaning or enhance its effect. On of the most common uses of the technique is in Motor Sports where the camera operator makes the background motion blur, and freezes the vehicle in clear sharp focus (or does the reverse of course)

Sometimes the effect is cause by accident, by not having the correct settings for the subject to be photographed (it happens a lot in bird photography.) However a happy mistake in my case because I like the effect.

 

Below is a classic example. The Hawk jet (from RAF Valley) is moving at about 400 mph to ‘freeze’ its movement one has to pan the camera following the track of the plane and with the correct shutter speed in relation to the aperture of the lens to create the sense of movement.

1/500 sec at f10 ISO 640

To see more shots from this day go to www.paulcrotty.co.uk/mach-loop

 

Patience! technique and skill are needed to capture a flying Dragonfly.
If you have seen them flying about you will be aware of the speed and erratic nature of their flight patterns,
hence you need very! high shutter speeds to get any sense of detail.
You will see much better images than this from photographers that devout many hours even days to getting ‘the shot’

This image of a Blue Tit is one of my favourite movement images, and it was one of those mistakes I mentioned above. However It captures just enough information to know what it is, but gives the dynamic sense of movement. Love it!