What F Setting???

Discussion in 'Photography' started by Jiminee Cricketee, Nov 11, 2011.

  1. What is t
     
    Jiminee Cricketee, Nov 11, 2011
    #1
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  2. Jiminee Cricketee

    dadiOH Guest

    Jiminee Cricketee wrote:
    > What is t


    Transmission. Essentially, f-stops after factoring in light loss in the
    lens. Most used in cinematography.

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    dadiOH
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    dadiOH, Nov 11, 2011
    #2
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  3. Jiminee Cricketee

    Alan Browne Guest

    On 2011-11-10 19:40 , Jiminee Cricketee wrote:
    > What is t



    On very few lenses (for still photography) and many lenses for motion
    film, "T" is the "Transmission factor" which is often slower than the
    maximum aperture. This indicates that there is light loss in the lens
    system.

    Some specialized still camera lenses, such as the Minolta (Sony) 135
    f/2.8 [T4.5] have a transmission factor (T). The "fastest" exposure
    will be at f/4.5 even if the depth of field is determined by a larger
    aperture (f/2.8 to f/4 ). In this case the light loss is due to the
    apodization filter.

    On some still cameras, usually Canon, "T" (or Tv) is the "period" or the
    shutter speed. Since shutter speeds are usually expressed as a fraction
    of a second, using "T" is more "correct" than "S" for speed. (eg: 1/60
    is a period which in scientific convention is the letter "T").


    --
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    Alan Browne, Nov 12, 2011
    #3
  4. Jiminee Cricketee

    Robert Coe Guest

    On Sat, 12 Nov 2011 10:34:56 -0500, Alan Browne
    <> wrote:
    : On 2011-11-10 19:40 , Jiminee Cricketee wrote:
    : > What is t
    :
    :
    : On very few lenses (for still photography) and many lenses for motion
    : film, "T" is the "Transmission factor" which is often slower than the
    : maximum aperture. This indicates that there is light loss in the lens
    : system.
    :
    : Some specialized still camera lenses, such as the Minolta (Sony) 135
    : f/2.8 [T4.5] have a transmission factor (T). The "fastest" exposure
    : will be at f/4.5 even if the depth of field is determined by a larger
    : aperture (f/2.8 to f/4 ). In this case the light loss is due to the
    : apodization filter.
    :
    : On some still cameras, usually Canon, "T" (or Tv) is the "period" or the
    : shutter speed. Since shutter speeds are usually expressed as a fraction
    : of a second, using "T" is more "correct" than "S" for speed. (eg: 1/60
    : is a period which in scientific convention is the letter "T").

    I don't think Canon is intentionally conforming to that "scientific
    convention". In their parlance, "Tv" stands for "Time value". If you choose
    that mode, the shutter speed you set remains fixed, and the aperture is set
    automatically.

    Bob
     
    Robert Coe, Nov 13, 2011
    #4
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