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Thread: What is CPU? in terms of photographic terms....

  1. #1
    Senior Member zoossh's Avatar
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    Default What is CPU? in terms of photographic terms....

    keep seeing this word, esp on lens. searching this word on google, only derives results for the computer CPU, and surprisingly a search in clubsnap using "CPU" as the key word derives no results.....

    anyone can advise?

  2. #2

    Default Re: What is CPU? in terms of photographic terms....

    Seeing the word where?

  3. #3

    Default Re: What is CPU? in terms of photographic terms....

    "...These have a "CPU" built into the lens, but this really is just a fancy way of saying it has an electronic transfer of basic lens information to the camera...."
    http://www.bythom.com/lensacronyms.htm

    I suspect that the lens CPU is nothing more than a computer chip that gives the camera body information regarding the lens etc. That's what I think. I may be wrong.

  4. #4

    Default Re: What is CPU? in terms of photographic terms....

    'Corrective Photography Unit'... has a complex hi-tech chip in there which analyzes the scene and immediately gives electrical shocks to the photographer if the composition is lousy...
    if my camera is there at the right moment, click, all I have to do is accept it.
    -edouard boubat

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    Default Re: What is CPU? in terms of photographic terms....

    Quote Originally Posted by Hobbesyeo
    "...These have a "CPU" built into the lens, but this really is just a fancy way of saying it has an electronic transfer of basic lens information to the camera...."
    http://www.bythom.com/lensacronyms.htm

    I suspect that the lens CPU is nothing more than a computer chip that gives the camera body information regarding the lens etc. That's what I think. I may be wrong.
    yah you are correct. That's what those electronic contacts on your lens are for... relaying of information. It will tell the camera what's the distance your lens is focused at, the aperture, the focal length, etc.

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    Senior Member zoossh's Avatar
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    Default Re: What is CPU? in terms of photographic terms....

    which means that most exif info is from the lens and not from the body, right?

  7. #7

    Default Re: What is CPU? in terms of photographic terms....

    Quote Originally Posted by zoossh
    which means that most exif info is from the lens and not from the body, right?
    No. It's from the body. The lens info is used by the body for exposure control and was there since film days where 'EXIF' is not even heard of yet. But, yes, a portion of the EXIF info pertaining to the lens such as the max aperture, min aperture, focal length, AF etc are actually provided by the lens to the body which generates the EXIF.
    Last edited by lsisaxon; 27th April 2006 at 02:17 PM.

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    Member smtan24's Avatar
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    Default Re: What is CPU? in terms of photographic terms....

    This links talks of auto focus and CPU.

    http://k41.pbase.com/o4/94/6094/1/56...LensInfo1r.jpg

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    Senior Member zoossh's Avatar
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    Default Re: What is CPU? in terms of photographic terms....

    Quote Originally Posted by lsisaxon
    No. It's from the body. The lens info is used by the body for exposure control and was there since film days where 'EXIF' is not even heard of yet. But, yes, a portion of the EXIF info pertaining to the lens such as the max aperture, min aperture, focal length, AF etc are actually provided by the lens to the body which generates the EXIF.
    what i mean is if i use a non-electronic lens on a digital body, i.e. zenitar fisheye lens 16mm f/2.8 on a nikon D50, if the lens doesn't tell the body what is the aperture size when the aperture ring is turned, would the body be able to generate the exif info on the aperture size used?

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    Member smtan24's Avatar
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    Default Re: What is CPU? in terms of photographic terms....

    Quote Originally Posted by zoossh
    what i mean is if i use a non-electronic lens on a digital body, i.e. zenitar fisheye lens 16mm f/2.8 on a nikon D50, if the lens doesn't tell the body what is the aperture size when the aperture ring is turned, would the body be able to generate the exif info on the aperture size used?
    No. On my camera it just generates f1 as the aperture.

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