Camera Shake Blurred
This image has two inherent problems camera shake and general blurredness.
Camera shake is caused when the camera moves when you dress the shutter with a long exposure. Simple ways to avoid this is to use a tripod or rest the camera on a solid surface and use a cable release.
Inaccurate focusing can be caused by a variety of reasons.
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The camera lens will not focus down to the required distance, in other words the subject is to close to the camera.
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Autofocus cameras can focus on another element in the image such as the background (though this in not the case with this image).
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The photographer not focusing the camera.
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The viewfinder eyepiece on many cameras can be modified to take into consideration the photographers eyesight prescription and may be set wrong.
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The subject moved (though not in this example)
The problems can be slightly reduced in image manipulation software though only a slight improvement could be made.