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Thread: 35mm Format = 24mm x 36mm or ...

  1. #1

    Default 35mm Format = 24mm x 36mm or ...

    Hullo, everybody,

    I am from the analog days and have this *question* arising from my pre-occupation with the discontinued Kodachrome 135 format from of old. Never did got an answer to this question, really. Now that the Internet is generoysly available and knowledgeable, here goes.

    Majority of DSLRs use the APS-C format which is based on the (reduced) 35mm format. The professional models uses full frame which is equal to the 35mm format. 35mm format got its root from 70mm film format (see http://en.wikipedia.org/wiki/135_film).

    How do you explain the dimension of 24mm by 36mm full frame (whether digital or analog) when the label was always 35mm? I doubt the 36 refers to the 35 exposures at that time.

    Note: In my search to have a completely clear understanding of the Nikon's DX/FX format against that offered by Canon, I got driven back to this nagging question.

  2. #2

    Default Re: 35mm Format = 24mm x 36mm or ...

    Quote Originally Posted by Ibanez View Post
    Hullo, everybody,

    I am from the analog days and have this *question* arising from my pre-occupation with the discontinued Kodachrome 135 format from of old. Never did got an answer to this question, really. Now that the Internet is generoysly available and knowledgeable, here goes.

    Majority of DSLRs use the APS-C format which is based on the (reduced) 35mm format. The professional models uses full frame which is equal to the 35mm format. 35mm format got its root from 70mm film format (see http://en.wikipedia.org/wiki/135_film).

    How do you explain the dimension of 24mm by 36mm full frame (whether digital or analog) when the label was always 35mm? I doubt the 36 refers to the 35 exposures at that time.

    Note: In my search to have a completely clear understanding of the Nikon's DX/FX format against that offered by Canon, I got driven back to this nagging question.
    Your link explains very well why it is called 35mm, the width of the actual film used is 35mm. The portion of the film used to capture the image is 24 by 36mm which is the dimension retained for digital sensors.

  3. #3
    Moderator catchlights's Avatar
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    Default Re: 35mm Format = 24mm x 36mm or ...

    just take a ruler to measure the film frame size, is 23.5mm by 35mm.

    and for 35mm film, the film is 35mm wide,

    for 70mm film, the film is 70mm wide.

    and for the name 135, is just a article code name for this particular size of film
    Shoot to Live, Live to Shoot
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  4. #4

    Default Re: 35mm Format = 24mm x 36mm or ...

    I believe 35mm refered to the entire width of the film including the perforations/sprockets, whereas the dimension somehow is close to the Golden Ratio, which supposedly creates a mathematically pleasing rectangle..

  5. #5

    Default Re: 35mm Format = 24mm x 36mm or ...

    if measure the film widthwise, its 35mm.

  6. #6

    Default Re: 35mm Format = 24mm x 36mm or ...

    slow in keying n already there r ans
    cheers CSers.

  7. #7

    Default Re: 35mm Format = 24mm x 36mm or ...

    The numbers come from the product codes, eg 135, 110, 120, 220 film. Obviously, 120 film is not 120 mm wide, neither is 220 film 220 mm wide.

    Quote Originally Posted by Ibanez View Post
    Hullo, everybody,

    I am from the analog days and have this *question* arising from my pre-occupation with the discontinued Kodachrome 135 format from of old. Never did got an answer to this question, really. Now that the Internet is generoysly available and knowledgeable, here goes.

    Majority of DSLRs use the APS-C format which is based on the (reduced) 35mm format. The professional models uses full frame which is equal to the 35mm format. 35mm format got its root from 70mm film format (see http://en.wikipedia.org/wiki/135_film).

    How do you explain the dimension of 24mm by 36mm full frame (whether digital or analog) when the label was always 35mm? I doubt the 36 refers to the 35 exposures at that time.

    Note: In my search to have a completely clear understanding of the Nikon's DX/FX format against that offered by Canon, I got driven back to this nagging question.

  8. #8

    Default Re: 35mm Format = 24mm x 36mm or ...

    So upon what reference was 135 derived from. Fuji also uses this "135" in their products.

    Quote Originally Posted by catchlights View Post
    just take a ruler to measure the film frame size, is 23.5mm by 35mm.

    and for 35mm film, the film is 35mm wide,

    for 70mm film, the film is 70mm wide.

    and for the name 135, is just a article code name for this particular size of film

  9. #9

    Default Re: 35mm Format = 24mm x 36mm or ...

    this queation is similar to one question which i'd always asked and haven't got a convincing answer..( an off topic subject ).why all the planets are round ? is there a square one ?
    note : planets, not meteor or others.
    Last edited by cabbySHE; 4th January 2010 at 06:24 PM.

  10. #10
    Moderator Octarine's Avatar
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    Default Re: 35mm Format = 24mm x 36mm or ...

    Quote Originally Posted by cabbySHE View Post
    this queation is similar to one question which i'd always asked and haven't got a convincing answer..( an off topic subject ).why all the planets are round ? is there a square one ?
    note : planets, not meteor or others.
    For 'Square Planets' you might want to google about "Borg" - although this is not a real planet. All the rest of matter has to follow gravity ...
    EOS

  11. #11

    Default Re: 35mm Format = 24mm x 36mm or ...

    Even more OT, its all gotta do with General Relativity..

  12. #12

    Default Re: 35mm Format = 24mm x 36mm or ...

    haha, coz of centripetal force. That's why planet is round.

  13. #13

    Default Re: 35mm Format = 24mm x 36mm or ...

    Quote Originally Posted by whattokingu View Post
    haha, coz of centripetal force. That's why planet is round.
    So is it gravity or centripetal force? The planet has mass so there is gravity. If the planet rotates then there is also some centripetal force but this force would be in the opposite direction and the shape would be more cylindrical along the axis and not spherical. But the resultant shape would be from the combination of all the forces.

    http://wiki.answers.com/Q/Why_are_planets_round

  14. #14

    Default Re: 35mm Format = 24mm x 36mm or ...

    I'll use PRS to jam with Ibanez.

  15. #15
    Moderator catchlights's Avatar
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    Default Re: 35mm Format = 24mm x 36mm or ...

    super OT liao.



    .
    Shoot to Live, Live to Shoot
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  16. #16

    Default Re: 35mm Format = 24mm x 36mm or ...

    my apology

  17. #17
    Senior Member Ansel's Avatar
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    Default Re: 35mm Format = 24mm x 36mm or ...

    Quote Originally Posted by Ibanez View Post
    So upon what reference was 135 derived from. Fuji also uses this "135" in their products.
    Same reason why HP copy paper got A4 size and Xerox copy paper also got A4 size.

    the designations 135, 120, 220, etc are like industry product codes and has got nothing to do with their physical dimensions. the "35" in 135 was a mere coincidence.

  18. #18
    Member agws1970's Avatar
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    Default Re: 35mm Format = 24mm x 36mm or ...

    Quote Originally Posted by Ibanez View Post
    Hullo, everybody,

    I am from the analog days and have this *question* arising from my pre-occupation with the discontinued Kodachrome 135 format from of old. Never did got an answer to this question, really. Now that the Internet is generoysly available and knowledgeable, here goes.

    Majority of DSLRs use the APS-C format which is based on the (reduced) 35mm format. The professional models uses full frame which is equal to the 35mm format. 35mm format got its root from 70mm film format (see http://en.wikipedia.org/wiki/135_film).

    How do you explain the dimension of 24mm by 36mm full frame (whether digital or analog) when the label was always 35mm? I doubt the 36 refers to the 35 exposures at that time.

    Note: In my search to have a completely clear understanding of the Nikon's DX/FX format against that offered by Canon, I got driven back to this nagging question.
    Google is your best friend. Google and this is your first hit.

    http://www.nwmangum.com/Kodak/FilmHist.html

    Haiz.

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