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Why is shutter speed and focal lengths important to check when capturing a digital image?
This is an example of FAST shutter speed
This is an example of SLOW shutter speed
Focal length can dictate perspective and alter how a subject appears in the frame. Wide lenses can distort where are as tele lenses can overly flatten
There is a rule of thumb to avoid camera shake when hand holding, which links focal length & shutter.
Shutter speed is one of the exposure controls (faster shutter less light, slower shutter more light) but also has a bearing on motion rendering.
An example would be if you are shooting sports and want to freeze the action then you need a slow shutter, if you want creative blur, say as on moving water, then a slow shutter is used.
Generally your shutter number should be the same or higher than your focal length to avoid camera shake blur.