Analoge <> digital objective?

Discussion in 'UK Photography' started by JennyC, May 11, 2007.

  1. JennyC

    JennyC Guest


    I'm new here and have a question: Is there a difference between an analoog
    objective and a digital one?

    I had Canon 350E with a Tamron 28/200 objective.

    I treated myself to a Canon 350D (came with an 18/55 objective)

    I kept the 28/200, but does not have such a wide angle on the 350D as it
    did on the old camera.

    Any idea please??
    JennyC, May 11, 2007
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  2. JennyC

    Alex Monro Guest

    Most digital SLR cameras have sensors that are smaller than the standard
    36x24mm 35mm film frame. In the case of the Canon 350D it's about 1.6x
    smaller (linear dimensions). This is sometimes known as the crop factor,
    because the smaller sensor effectively crops the borders off the picture.

    The effect of this is that the angle of view you get with a given focal
    length lens on a DSLR will be similar to what you'd get if you used a
    lens of crop factor x that focal lemgth on a 35mm film camera. So your
    Tamron 28-200 gives you field of view similar to a 49-320mm lens on the
    350E. This is great if you wanted a longer telephoto, but not so good
    if you want wide angle.

    Another side effect of the smaller sensor is that you get more depth of
    field for a given angle of view and aperture than you'd get with 35mm
    Alex Monro, May 11, 2007
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  3. JennyC

    JennyC Guest

    Thanks Alex,

    I can see I shall be looking at a Tamron 18-250 XR Di II.................:~)

    JennyC, May 11, 2007
  4. JennyC

    Trev Guest

    Well you have that range at the moment
    Trev, May 11, 2007
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