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Thread: auto focusing question

  1. #1
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    Default auto focusing question

    Hi,


    http://www.flickr.com/photos/61661287@N06/5610086506/

    i am just trying to test the whether my camera focusing is working properly.

    i using manual focus at center, 50mm f1.8.

    i point at the "50mm" center point of focus(position around "0"). after that half press shutter release to auto focus, and take shot.

    but the result is that "60mm" is much more in focus compared with 50mm..

    any comment on this?
    Last edited by mokkimhong; 11th April 2011 at 10:11 PM.

  2. #2
    Senior Member Diavonex's Avatar
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    Default Re: auto focusing question

    What focusing mode are you using when in auto?

  3. #3
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    Default Re: auto focusing question

    Quote Originally Posted by Diavonex View Post
    What focusing mode are you using when in auto?

    manual focus at center.
    pointing at around "50"

  4. #4
    Senior Member Diavonex's Avatar
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    Default Re: auto focusing question

    You should use Spot Focus when doing test like this.

    There are generally 3 different modes:

    1. Multi-point

    2. Center Focus

    3. Spot Focus

  5. #5
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    Default Re: auto focusing question

    sorry, wrong info previously.

    it was auto-focus, but i choose only center focus point.

    >.<
    Last edited by mokkimhong; 12th April 2011 at 12:34 AM.

  6. #6

    Default Re: auto focusing question

    When testing for front/back focus issues:

    mount ur camera on a tripod, set timer (or if u hv shutter release cable u can use that) to reduce vibrations.

    If u handheld, it will not be accurate due to the extremely shallow DOF.

  7. #7
    Moderator catchlights's Avatar
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    Default Re: auto focusing question

    since you already download the Focus Test Chart, why don't follow the instruction closely?
    Shoot to Live, Live to Shoot
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  8. #8
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    Default Re: auto focusing question

    http://www.flickr.com/photos/61661287@N06/5613103637/ ==> NG
    http://www.flickr.com/photos/61661287@N06/5613101905/ ==> quite OK

    i have tested quite a lot..

    sometime, the 1st NG image will appear..

    any idea why this happen?

  9. #9
    Moderator rhino123's Avatar
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    Default Re: auto focusing question

    Have u mount your camera on tripod?

  10. #10
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    Default Re: auto focusing question

    yes. mounted

    i just keep on pressing on shutter button with 2 sec delay.

  11. #11
    Moderator rhino123's Avatar
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    Default Re: auto focusing question

    You would need to check, if all constraint is the same... also, do you press the shutter directly on your camera, or use a remote control? Because when you press directly on your camera, even if your camera is mounted, there might still be some movement in your camera.

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