Selecting the shutter speed

when you use a longer lens and you want the images to be sharp - you will need to increase the shutter speed – a very general rule with 35mm film cameras in selecting the shutter speed is that it should match the focal length of the lens –

so a 50mm or standard lens would need a shutter speed of 1/50 ( 1/60) sec

 

 

With a 200mm telephoto lens camera shake is more likely and the shutter speed would be 1/200

 

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and with a 20mm wide angle where camera shake is not so critical you would be able to work with 1/20 sec .

Because the ccd of a digital cameras is a different size than the 35mm film, these shutter speed would apply to the focal length of the lens not the conversion or equivalent 35mm film lens.