Results 1 to 11 of 11

Thread: [help] Nikon D3100 internal Lens AF Motor

  1. #1
    Member
    Join Date
    Apr 2011
    Location
    Singapore, Singapore, Singapor
    Posts
    3

    Default [help] Nikon D3100 internal Lens AF Motor

    Hi owners of D3100,

    Have u all experienced before that the AF motor autofocus does not autofocus at the auto mode? While i switch to A mode, it works.

    The 'ch chh' sound while the autofocus motor is adjusting has also gone softer.

    Have any bros encountered similiar issues before?

    Is my lens faulty?

    or r there any settings that i have set wrongly?

    Thanks in advance

  2. #2
    Member
    Join Date
    Oct 2011
    Location
    Singapore
    Posts
    229

    Default Re: [help] Nikon D3100 internal Lens AF Motor

    What lens are you using? How old is it?

  3. #3
    Member
    Join Date
    Apr 2011
    Location
    Singapore, Singapore, Singapor
    Posts
    3

    Default Re: [help] Nikon D3100 internal Lens AF Motor

    Hi mds80

    I'm actually using the default lens...

    I bought it about a month ago.

    previously when in automode, i could feel the AF zooming in and out, but now not anymore, the A mode still works though.. and also with a softer noise

  4. #4
    Senior Member ZerocoolAstra's Avatar
    Join Date
    Mar 2008
    Location
    rainy Singapore
    Posts
    9,523

    Default Re: [help] Nikon D3100 internal Lens AF Motor

    Quote Originally Posted by Stanley Pang View Post
    Hi mds80

    I'm actually using the default lens...

    I bought it about a month ago.

    previously when in automode, i could feel the AF zooming in and out, but now not anymore, the A mode still works though.. and also with a softer noise
    Which Auto mode is this? Is it the green 'Auto' on the mode dial of the camera?

    http://images.brighthub.com/ba/b/bab...478b_small.jpg

    Or is it the 'A M' switch on the lens itself?

    http://www.kenrockwell.com/nikon/18-..._4471-side.jpg


    If you're referring to the kit lens 18-55mm f/3.5-5.6, the front focusing ring should be turning whilst the lens is focusing.
    Last edited by ZerocoolAstra; 14th May 2012 at 02:33 PM.
    Exploring! :)

  5. #5
    Member
    Join Date
    Apr 2011
    Location
    Singapore, Singapore, Singapor
    Posts
    3

    Default Re: [help] Nikon D3100 internal Lens AF Motor

    in the past, i had the mode dial on the green auto and with A mode on the lens, the autofocus could work.

    However, now i had to switch to both mode dial on the A and with A mode on the lens to 'feel' the AF auto-adjusting.

    and my biggest concern is the strange chh chh sound while focusing.. when it was well and good, the noise was louder and crisp. now there is like a jammed soft sound.

  6. #6
    Moderator rhino123's Avatar
    Join Date
    Sep 2006
    Location
    NA
    Posts
    5,247

    Default Re: [help] Nikon D3100 internal Lens AF Motor

    Quote Originally Posted by Stanley Pang View Post
    in the past, i had the mode dial on the green auto and with A mode on the lens, the autofocus could work.

    However, now i had to switch to both mode dial on the A and with A mode on the lens to 'feel' the AF auto-adjusting.

    and my biggest concern is the strange chh chh sound while focusing.. when it was well and good, the noise was louder and crisp. now there is like a jammed soft sound.
    Not sure what is the problem... but the simplest way was to take it down to the NSC for testing and checking.
    I am not a photographer, just someone who happened to have a couple of cameras.
    My lousy shots

  7. #7
    Senior Member ZerocoolAstra's Avatar
    Join Date
    Mar 2008
    Location
    rainy Singapore
    Posts
    9,523

    Default Re: [help] Nikon D3100 internal Lens AF Motor

    Just note that the mode dial on the camera has nothing to do with auto-focusing.

    I recall once before during a sunrise outing, one of the newbies had pressed a button like 'AF-L' or something, which locked the focus and prevented the AF from doing its thing. Not sure if D3100 has this feature.

    The sound is another matter though. Perhaps foreign object kena stuck. Better be a bit more careful.
    Exploring! :)

  8. #8
    Member
    Join Date
    Oct 2011
    Location
    Singapore
    Posts
    229

    Default Re: [help] Nikon D3100 internal Lens AF Motor

    Strange for the AF mechanism to get jammed when it's so new. Either there's something stuck or it's a lemon.

  9. #9
    Member fmeeran's Avatar
    Join Date
    Nov 2010
    Location
    Clementi, Singapore
    Posts
    834

    Default Re: [help] Nikon D3100 internal Lens AF Motor

    Quote Originally Posted by rhino123 View Post
    Not sure what is the problem... but the simplest way was to take it down to the NSC for testing and checking.
    +1

    Better to take it to NSC since you have warranty.
    Dxxxx | 35/1.8 | 50/1.8 | Tokina 28-70 | Panny G1 | 14-45 | 25/1.7
    My Flickr

  10. #10
    Moderator Octarine's Avatar
    Join Date
    Jan 2008
    Location
    Pasir Ris
    Posts
    12,390

    Default Re: [help] Nikon D3100 internal Lens AF Motor

    Quote Originally Posted by mds80 View Post
    Strange for the AF mechanism to get jammed when it's so new. Either there's something stuck or it's a lemon.
    But it's also only he kit lens: cheap and simple. The Canon equivalent has issues with the flexible ribbon cable. If it's newly purchased (means: still covered by warranty) just bring it to Service Center.
    EOS

  11. #11

    Default Re: [help] Nikon D3100 internal Lens AF Motor

    did you locked the AF point?
    D7000 + 50mm

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •