Manual or Auto Focus on D90

Discussion in 'Photography Beginners' Forum' started by arkuro, Aug 25, 2010.

  1. arkuro

    arkuro TPF Noob!

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    I am using a D90 currently and I seem to get the impression that autofocus on D90 is not good enough so sometimes I have to switch to manual focus. Also I am confused that if I choose the focus point in single point focus mode D90 will 100% focus on that point or the focus depends on some other factors. It will be greatful if somebody could answer this.

    Thanks!!!
     
  2. greatest335i

    greatest335i TPF Noob!

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    really i find the auto focus is pretty good on the D90
     
  3. Kofman13

    Kofman13 TPF Noob!

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    my d90 never fails to autofocus well. except in super low light, then i just focus on something relatively bright at the same distance
     
  4. KmH

    KmH Helping photographers learn to fish Supporting Member

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    The center focus point is a cross-type focus point giving 2-dimensional contrast detection and is the most accurate focus point you have available. The other 10 focus points only give 1-dimensional contrast detection (vertical).

    Focus accuracy is also affected by the lens aperture. Nikon states an auto focus threshold of f/5.6.

    In low light, the D90 has an auto focus assist light that is enabled/disabled with a camera menu setting. Be sure and re-read your camera users manual.

    For a general understanding of how contrast-detection auto focus systems work visit:
    Understanding Camera Autofocus
     
  5. arkuro

    arkuro TPF Noob!

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    Thanks I will read it .. if i have any doubts i hope somebody will clear it .. thanks a lot to everybody :)
     

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