AF-S on a NIKON body with AF motor

Discussion in 'Photography Equipment & Products' started by iskoos, Jan 26, 2010.

  1. iskoos

    iskoos TPF Noob!

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    If an AF-S lens (the ones that have AF motor in the lens body) used on Nikon body with AF motor in it (like D90) which motor is used to autofocus? The one in the camera or the one in the lens?
     
  2. PhotoXopher

    PhotoXopher TPF Noob!

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    AF-S lenses don't have the mechanism to be driven by the internal (body) AF motor. AF-S and similar lenses are always driven by the internal (lens) motor.
     
  3. Derrel

    Derrel Mr. Rain Cloud

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    The motor in the lens will be used if the lens is AF-i or AF-S. AF-i is the first in-lens motor protocol that came before AF-S.
     
  4. iskoos

    iskoos TPF Noob!

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    Pretty clear. Thanks to both of you...

    One more... If an AF-S mounts on a D40, in-lens motor will be used for AF. If an AF lens mounts on a D40, then AF will not be achieved since no AF motor is present thus the only option is MF. Correct?
     
  5. ghache

    ghache TPF Noob!

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    you are correct.

    lens without the internal focus motor will not auto-focus on d40/x, d60/x, d3000 and possibly the d5000, i am not sure.
     
  6. PhotoXopher

    PhotoXopher TPF Noob!

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    Correct for all 'baby Nikons'.

    D40, D60, D3000 and D5000.
     
  7. Garbz

    Garbz No longer a newbie, moving up!

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    In case you're interested in how this works, in the bottom right of the lens mount is a mechanical AF coupling.
    [​IMG]

    On AF-S lenses and old manual focus lenses the flat screw coupling in the bottom right of the above lens mount is absent, even if the camera tried it wouldn't be able to focus an AF-S lens using the body motor.
     
  8. iskoos

    iskoos TPF Noob!

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    Hey Garbz, thank you for that picture. I really wanted to see the back of Nikon lens.
    I looked at the picture you posted and I see that flat screw coupling.
    I will ask another question now, it may sound a bit too detailed but bear with me please...:))
    If you mount an AF-S lens (which will not have that flat screw coupling as you mentioned) on D90, the AF will get done thru the in-lens motor since no mechanical connection can be made between the camera and the lens. But in this case would the AF motor (inside the camera body) still spin during the autofocus process? Or would the camera know that it is using lens's AF motor and not power the AF motor inside the camera body?

    Just my curiosity:)
     
  9. PhotoXopher

    PhotoXopher TPF Noob!

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    Camera knows all. :)

    It won't do anything if a lens not requiring it is used.
     
  10. Garbz

    Garbz No longer a newbie, moving up!

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    If you look at your camera with the lens off you'll find the screw mechanism is recessed. It won't (shouldn't?) even extend the coupling if you have a non-AF lens mounted. These things are clever indeed. The camera has historically known everything about the lens. Even these days what is done with electronics was in the past done with cleverly placed notches in the mount mechanism. For instance the notch on the 9:30 position of that lens indicates the lens is post AI, and the post sticking out at the bottom indicates it's not a pre-AI lens.
    That's a simplistic example anyway.
     
    Last edited: Feb 3, 2010
  11. PatrickHMS

    PatrickHMS TPF Noob!

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    Don't forget D40X.

    Even if AF lens will not autofocus on the "baby Nikons' " there is a green light inside viewfinder that will come on when camera sees an in focus condition.

    You will have to manually focus the shot, but the camera will tell you when you have done that.

    I believe that to be correct for all of the "baby Nikons' "
     
  12. iskoos

    iskoos TPF Noob!

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    If I had a Nikon, I doubt I would ask any of these questions. I have an extreme curiosity and passion for electromechanical gizmos. That's why I ask all these anal questions...:lmao:

    If had an opportunity to play with a Nikon DSLR camera one day, you bet I will look at all these things...
     

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