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Thread: Focal Length

  1. #1

    Default Focal Length

    hmm......

    Given 2 DC.
    DC A ( 35mm wide )
    DC B ( 40mm wide )

    Is there a difference in the photo when both DC are at the same spot without zoom? I suppose DC B will produce a little little more zoom out photo?

    Given 1 DC and 1 Lens. Example only.
    DC A ( 35mm - 350mm )
    Lens B ( 70mm - 400mm )

    Although DC A has a 10X optical zoom compared with Lens B's 5X+ zoom ( taking 400 / 70 ), I suppose the latter provide more zoom as it's tele range is bigger?

  2. #2
    Senior Member
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    Default Re: Focal Length

    Originally posted by revenant
    hmm......

    Given 2 DC.
    DC A ( 35mm wide )
    DC B ( 40mm wide )

    Is there a difference in the photo when both DC are at the same spot without zoom? I suppose DC B will produce a little little more zoom out photo?

    Given 1 DC and 1 Lens. Example only.
    DC A ( 35mm - 350mm )
    Lens B ( 70mm - 400mm )

    Although DC A has a 10X optical zoom compared with Lens B's 5X+ zoom ( taking 400 / 70 ), I suppose the latter provide more zoom as it's tele range is bigger?
    Yup.

    That's why the "so many times zoom" thing is misleading. Using "Focal Length in mm" is more accurate.

    Regards
    CK

  3. #3

    Default Re: Re: Focal Length

    Originally posted by ckiang


    Yup.

    That's why the "so many times zoom" thing is misleading. Using "Focal Length in mm" is more accurate.

    Regards
    CK
    thanx very much

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