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Thread: What type of focusing problem is this?

  1. #1

    Default What type of focusing problem is this?

    i focused on the word instructions but only the left right and top are in focus....
    its a third party(Tamron) lens, anyone got any idea where i can send it for recalibration and roughly how much it cost?


  2. #2
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    Default Re: What type of focusing problem is this?

    You'll have to sent it for lens calibration with the problem, back focusing.

  3. #3

    Default Re: What type of focusing problem is this?

    Are you sure it's out of focus, as in, did you select only the center focusing point?

    The tube is of OXY is tubular and tapered . Not exactly the best subject to use for a focusing test. Could be that the focusing locked on the further points (sides of tube, and the taoered portion), or that the lens was just that bit too close and past the MFD.

    Sides, where does one get a Tamron serviced in Singapore?

  4. #4
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    Default Re: What type of focusing problem is this?

    Hmm... has anyone ever successfully convinced either Canon or Tamron to calibrate a Canon/Tamron combination?

  5. #5

    Default Re: What type of focusing problem is this?

    Quote Originally Posted by blurboiboi View Post
    i focused on the word instructions but only the left right and top are in focus....
    its a third party(Tamron) lens, anyone got any idea where i can send it for recalibration and roughly how much it cost?
    It looks like quite a close up shot where the DoF can be quite shallow. Before you blame the misfocus on the lens or the body, did you shoot this handheld or using a tripod? The reason for asking is if you had not used a tripod, there is a chance that you might have moved a little forward after you locked focus before the shutter was released.

  6. #6

    Default Re: What type of focusing problem is this?

    Quote Originally Posted by Dream Merchant View Post
    Are you sure it's out of focus, as in, did you select only the center focusing point?

    The tube is of OXY is tubular and tapered . Not exactly the best subject to use for a focusing test. Could be that the focusing locked on the further points (sides of tube, and the taoered portion), or that the lens was just that bit too close and past the MFD.

    Sides, where does one get a Tamron serviced in Singapore?
    Quote Originally Posted by lsisaxon View Post
    It looks like quite a close up shot where the DoF can be quite shallow. Before you blame the misfocus on the lens or the body, did you shoot this handheld or using a tripod? The reason for asking is if you had not used a tripod, there is a chance that you might have moved a little forward after you locked focus before the shutter was released.
    hihi... thanks for the pointers... i did it by placing the camera on a table and shooting the tube with timer mode... i shall go test it again with tripod and perhaps shooting a flat surface this time round.... does newspapers help??
    Last edited by blurboiboi; 6th July 2008 at 07:56 AM.

  7. #7

    Default Re: What type of focusing problem is this?



    hi all...
    with the above pic can i confirm that my lens has back focusing problem??...
    focusing point is boxed up in white.... shot with tripod and timer...
    thanks so much....

  8. #8

    Default Re: What type of focusing problem is this?

    Yeah, that looks like back-focusing.

  9. #9
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    Default Re: What type of focusing problem is this?

    It just looks like trying to focus nearer than the minimum focusing distance to me. The camera might have just selected the minimum focus distance and taken the shot, regardless of where you're trying to focus.
    incywincyspider climbup the waterspout...

  10. #10

    Default Re: What type of focusing problem is this?

    Quote Originally Posted by blurboiboi View Post

    hi all...
    with the above pic can i confirm that my lens has back focusing problem??...
    focusing point is boxed up in white.... shot with tripod and timer...
    thanks so much....
    Yup.. confirm back focused. If your other lenses are ok, then you should call Tamron up to get the lens calibrated. Sigma is able to calibrate their lenses, so I guess Tamron should do the same rather than pushing the blame to the body. If still under warranty, Tamron should calibrate it for free.
    Last edited by lsisaxon; 7th July 2008 at 09:47 AM.

  11. #11

    Default Re: What type of focusing problem is this?

    Quote Originally Posted by karnage View Post
    It just looks like trying to focus nearer than the minimum focusing distance to me. The camera might have just selected the minimum focus distance and taken the shot, regardless of where you're trying to focus.
    I don't think TS is so careless to try to focus at something the lens couldn't. And even if that might be the case, the focus would not lock and sometimes depending on the settings, the shutter would not release.

  12. #12
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    Default Re: What type of focusing problem is this?

    Focusing with F4, my lens is clear. But at F2.8, it seems to be double image! So is it back focusing problem as well? Just got the lens from a lens swop plus top up. Or does it has a problem working with 40D?

  13. #13

    Default Re: What type of focusing problem is this?

    Hope u get the repair free since its under waranty

  14. #14

    Default Re: What type of focusing problem is this?

    Either way, expect to face a one month waiting time for it to be sent back to Japan for calibration
    Canon EOS 30D , EF 17-40mm F4L USM , EF-S 55-250mm F/4-5.6 IS

  15. #15

    Default Re: What type of focusing problem is this?

    After reading all this, comparing the Tamron 17-50 and the Tokina 16-50, would you all prefer Tokina?

  16. #16

    Default Re: What type of focusing problem is this?

    Quote Originally Posted by Pokka View Post
    After reading all this, comparing the Tamron 17-50 and the Tokina 16-50, would you all prefer Tokina?
    that could be a solution, but give that tokina is abt 30% (600+ vs 900+) more expensive than the Tamron, it might make budget photographers like me think twice.

    found this interesting comparison http://www.flickr.com/photos/nschaden/1332341897/
    from my point of view, in terms of picture quality, it seems that tamron is a tad better

    anyway coming back to the topic, yeah it sure looks like back focusing. wat lens r u using and on which body ah-boi?
    Photographs doesn't arouse me, but the hard work it took to make them does.

  17. #17

    Default Re: What type of focusing problem is this?

    If you own a Canon, not worth buying a 3rd party lens for 900+ when for a hundred or so bucks more, can get a original Canon lens...and an L at that.
    Canon EOS 30D , EF 17-40mm F4L USM , EF-S 55-250mm F/4-5.6 IS

  18. #18

    Default Re: What type of focusing problem is this?

    sorry but can someone explain what back focusing is?

  19. #19

    Default Re: What type of focusing problem is this?

    Quote Originally Posted by jjj849 View Post
    sorry but can someone explain what back focusing is?
    Imagine 3 people A B C standing in a line. You focus at B who is standing in the middle but the camera's actual focus is on A. This is back focusing. If the focus is on C, it is front focusing.

  20. #20

    Default Re: What type of focusing problem is this?

    Quote Originally Posted by jjj849 View Post
    sorry but can someone explain what back focusing is?
    u can go to this link n read up a bit http://focustestchart.com/chart.html
    scroll down to "What is back focus?"
    Photographs doesn't arouse me, but the hard work it took to make them does.

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