lens

Discussion in 'Digital Cameras' started by Jul, Mar 7, 2005.

  1. Jul

    Jul Guest

    hi,

    Specification for Canon G5 says that lens 7.2 - 28.8 (35 mm equivalent 35 -
    140)
    The ratio at both cases 1:4
    but why 7.2 equivalent 35 (not 30 or 40) ?
    does 7.2 for any model equivalent 35?
    if not how to know what number equivalent 35 mm?

    and what does mean 1:2.0 - 3.0?
    all of these numbers on the lens

    Thanks.
     
    Jul, Mar 7, 2005
    #1
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  2. Jul

    [BnH] Guest

    Canon G5 .. .as you typed :

    7.2 -> 28.8 mm [ this is the 1:4 ratio .... == 4x zoom ] on 35mm range ..
    it covers 35-140mm range.

    f/ 2.0 -> 3.0 the max aperture at wide end is 2.0 and at the tele end is
    3.0.

    =bob=

    "Jul" <> wrote in message
    news:fhOWd.2549$...
    > hi,
    >
    > Specification for Canon G5 says that lens 7.2 - 28.8 (35 mm equivalent
    > 35 - 140)
    > The ratio at both cases 1:4
    > but why 7.2 equivalent 35 (not 30 or 40) ?
    > does 7.2 for any model equivalent 35?
    > if not how to know what number equivalent 35 mm?
    >
    > and what does mean 1:2.0 - 3.0?
    > all of these numbers on the lens
    >
    > Thanks.
    >
     
    [BnH], Mar 7, 2005
    #2
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  3. Jul wrote:

    > hi,
    >
    > Specification for Canon G5 says that lens 7.2 - 28.8 (35 mm equivalent 35 -
    > 140)
    > The ratio at both cases 1:4
    > but why 7.2 equivalent 35 (not 30 or 40) ?
    > does 7.2 for any model equivalent 35?
    > if not how to know what number equivalent 35 mm?
    >
    > and what does mean 1:2.0 - 3.0?
    > all of these numbers on the lens
    >
    > Thanks.
    >
    >

    The 35 mm equivalent is used to refer to a film camera using 35mm film.
    Many digital camera users are ones who had used 35mm in past. These
    folks had acquired a feel for the field of view, or perspective, of a
    given focal length on their 35mm camera. I myself am in that category.
    If the ad says the digicam has an 8mm - 24mm range of actual focal
    length, I must find the chip size and do some math to see what actual
    field of view the lens covers. If they say it is a 30-90 mm 35mm
    equivalent, I know it goes from moderate wide angle to moderate telephoto.
     
    Don Stauffer in Minneapolis, Mar 7, 2005
    #3
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