How does digital camera efl effect camera shake?

Discussion in 'Digital Photography' started by Guest, Dec 17, 2003.

  1. Guest

    Guest Guest

    How does the "equivalent focal length" ratio of digital cameras effect
    shutter speed settings for avoiding camera shake? I know that the rule of
    thumb on 35mm cameras is to set a shutter speed ratio higher than the focal
    length of the lens. Example: 1/60 sec. for a 55mm lens, 1/250 sec. for a
    210 mm lens, etc.

    But my Digital Rebel has a 1.6 multiplying effect on focal length, where a
    35mm lens is a "normal" lens, equivalent to using a 55mm lens on a 35mm
    camera. On my Rebel a 300mm lens acts like a 480mm lens would on a 35mm

    Does that mean that I should increase the shutter speed proportionally?
    Common sense suggests so, but my Rebel's automatic settings seem to work
    pretty well and they appear to stick strictly with the old 35mm rule: with
    my zoom lens at 200 my Rebel only warns of shutter speeds below 1/200 sec.,
    and so forth.
    Guest, Dec 17, 2003
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