Nikon ....ai??

Discussion in 'Nikon' started by Rod, Oct 29, 2003.

  1. Rod

    Rod Guest

    what does AI stand for. Im just getting into nikon and i need somehelp with
    this!1

    Rod
     
    Rod, Oct 29, 2003
    #1
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  2. Rod

    Clanger Guest

    AI stands for Automatic Indexing. AI allows you to perform metering with the
    lens wide open at it's maximum aperture (so you can see to focus with the
    screen at it's brightest) - then as the shutter is released, the lens "stops
    down" (or the aperture becomes smaller to what you have set on the ADR) to
    properly expose the picture.

    Non - AI stands for the early bayonet-mount lens series that did not offer
    automatic indexing. You will often see these lenses offered for sale and
    described variously as "NonAI", "NAI (erroneously - NAI should stand for
    Nikon AI)", "Lenses with prong IC" or even "Nikon prong". One clue that a
    lens is Non-AI is when you see a description such as "Nikkor-Q 135/2.8" -
    The "Q" (or other letters) is the early designation that gives the number of
    elements in the lens.

    In fact go here its very interesting stuff

    http://www.nikonlinks.com/unklbil/nomenclature.htm

    clanger
     
    Clanger, Oct 29, 2003
    #2
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  3. Rod

    Matt Clara Guest

    Matt Clara, Oct 29, 2003
    #3
  4. Rod

    Adam F Guest

    actually, it's just the way Ali G says Nikon.


    adam f
     
    Adam F, Oct 29, 2003
    #4
  5. What you describe in the first paragraph is known as "open aperture metering".
    Both AI and non-AI offer this. The difference is that, in a non-AI TTL
    system, you have to tell the camera the maximum aperture of the lens in
    use. This is known as "indexing". There are various schemes to do
    this, depending on the camera body. Some older cameras required that
    you manually set the max aperture somewhere on the camera, or manually
    lined up the film speed with a pointer corresponding to the lens max
    aperture. Most of the later non-AI cameras just required you to twist
    the aperture ring back and forth to the min and max aperture after
    mounting the lens and before metering. This was known as semiautomatic
    indexing. After doing this indexing operation, a non-AI lens on a
    non-AI camera works just like an AI lens on an AI camera.

    The AI system just eliminates the need to do the indexing operation,
    simplifying the processes of swapping lenses a little.

    Of course, if you have an AI camera, you won't get open aperture metering
    on a non-AI lens. A non-AI camera will do open-aperture metering on any
    lens that has the meter coupling prong, which is essentially all
    non-AI lenses and most manual focus AI lenses. Old lenses can be converted
    to work with new cameras, and new lenses can be converted to work with
    old cameras.

    --Rich
     
    Richard Cochran, Oct 29, 2003
    #5
  6. Rod

    Lewis Lang Guest

    AI stands for Artificial Intelligence. AI is what you get after going through
    two decades of the American education system, which is a lot like the
    Emeregency Broadcast system but the tests are not as hard especially once
    they've been kicked in...

    "This is a testes, it is only a testes..."

    Lewis

    "AI" is also a post-humously finished (by "Mr. Duel", Steven Speilberg) Stanley
    Kubrick film appearing after "Eyes Wide Shut" and the never gotten round to
    project "Napolean". The H.A.L. 9000 was supposed to play the lead until Epson
    replaced it with a non-S.A.G. scab 3 picoliter seven non-lead ink 5660 ppi ink
    jet printer as a cheaper actor, Harvey K-Tel was supposed to play Napolean's
    scrappy side kick, Dolly Lama, the cloned Western booted big breasted hooker
    Country Western singer with a heart of gold lame'... or maybe I got that
    confused with "AI"? Or perhaps I wwas thinking of a Chocolate Éclair instead of
    a Napolean? ;-).

    Lewis
     
    Lewis Lang, Nov 2, 2003
    #6
  7. Rod

    Tony Guest

    Who is Napolean, I only know of the Scicilian born leader of the French in
    the 18th century, whose name was Napoleon Boanaparte
     
    Tony, Nov 2, 2003
    #7
  8. .... or Sicilian...
    ....or Bonaparte...

    Glass houses, stones, etc.
     
    Stephen H. Westin, Nov 4, 2003
    #8
  9. Rod

    Tony Spadaro Guest

    I know a few thousand Corsicans who are going to be mad at you, Tony.
     
    Tony Spadaro, Nov 5, 2003
    #9
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