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Thread: 50mm f1.8 focus

  1. #1

    Default 50mm f1.8 focus

    im new here and
    I just bought 50mm f1.8 prime lens and i had this focus problem.
    i set my lens on AF , lock on a particular place to be focused, and snap a picture at f2.8 . the focus wasnt where i wanted it to be.
    tried every possible way,just that sometimes,i just
    focus, and sometimes it wont. The sharpness wasnt as sharp as what i expected.
    is the lens faulty? or my camera body fault?

    i need advices and opinions thank you.

  2. #2
    Member dingaroo's Avatar
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    Default Re: 50mm f1.8 focus

    Canon service centre is at Keppel Bay Tower, easily accessible by MRT. And if you drive, you can always park at Seah Im Car Park or even Harbourfront Towers.

    Service Hotline is 6799 8686.

    Customer Service Centre
    1 HarbourFront Ave
    #04-01 Keppel Bay Tower
    Singapore 098632

    Opening Hours are:
    Monday to Friday,
    9.30am - 7pm
    (closed on public holidays)

    Directions getting there.

    You can always pre-register first before going down if you don't like to wait, here's the LINK.


    This service has been brought to you by Dingaroo ... no connections whatsover to Canon, except being a Canon user ...
    A picture a day keeps the blues away!

  3. #3

    Default Re: 50mm f1.8 focus

    wa if i didn't check your public profile i wouldn't know you are a canon user

    anyway i stumbled upon a thread where someone shared the following link:

    http://focustestchart.com/focus21.pdf

    it's to test if your lens has front or back focusing issue which may explain why the photo isn't sharp...even at f/2.8 the depth of field is still very shallow

    follow the instructions as stated to carry out the test

    all the best!

    I'm a nikon user btw

    next time remember to test the lens carefully before walking out of the shop

  4. #4
    Senior Member sinned79's Avatar
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    Default Re: 50mm f1.8 focus

    post your photo.

  5. #5

    Default Re: 50mm f1.8 focus

    try centre AF point.
    --

  6. #6

    Default Re: 50mm f1.8 focus

    Quote Originally Posted by machiavellian View Post
    try centre AF point.
    i think centre af point and recompose wont work for shallow dof of 1.8 or 2.8.
    you should try using a tripod and set the af point to the actual subject that you are wanting to focus on. anyway 50 1.8 is a lens that is known to have high rate of misfocus...
    Canon EOS 550D|BG-E8|Tamron 17-50 f2.8|18-55mm IS|55-250mm IS|
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  7. #7
    Senior Member Override2Zion's Avatar
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    Default Re: 50mm f1.8 focus

    I would suggest you perform a test for front/back focusing following the instructions on the site http://focustestchart.com/chart.html. That will determine for sure if your lens is really suffering from such problems and to what extent.
    Nikon D200/D700/D800 User :)
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  8. #8
    Moderator Octarine's Avatar
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    Default Re: 50mm f1.8 focus

    Quote Originally Posted by deathrequiem View Post
    anyway 50 1.8 is a lens that is known to have high rate of misfocus...
    Never had any issue with my copy, always spot on.
    There was a recommendation here by one fellow about possible problems due to the micro motor AF and the slack in the gear. He solved it by switching the lens to manual focus, turning the AF ring to one end, switching to AF again and focusing. Alternatively one could also Servo AF (continuous focusing) to force the camera to check the focus repeatedly. But of course, recomposing is not possible then.
    EOS

  9. #9
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    Default Re: 50mm f1.8 focus

    Quote Originally Posted by ley35 View Post
    im new here and
    I just bought 50mm f1.8 prime lens and i had this focus problem.
    i set my lens on AF , lock on a particular place to be focused, and snap a picture at f2.8 . the focus wasnt where i wanted it to be.
    tried every possible way,just that sometimes,i just
    focus, and sometimes it wont. The sharpness wasnt as sharp as what i expected.
    is the lens faulty? or my camera body fault?

    i need advices and opinions thank you.
    You may have focus subject nearer than the MFD of the lens?

  10. #10

    Default Re: 50mm f1.8 focus

    Quote Originally Posted by Jamesf View Post
    You may have focus subject nearer than the MFD of the lens?
    No i didnt. Im shooting a portrait shot, and it doesnt seem to be as sharp. i dont knw why.

  11. #11

    Default Re: 50mm f1.8 focus

    Thanks guy for your kind help. i'll try doing the test now and get back to you guys!

  12. #12

    Default Re: 50mm f1.8 focus

    The AF is a bit kuku by design, you might wanna try this...
    http://www.clubsnap.com/forums/showthread.php?t=758769

  13. #13

    Default Re: 50mm f1.8 focus

    Quote Originally Posted by CamInit View Post
    The AF is a bit kuku by design, you might wanna try this...
    http://www.clubsnap.com/forums/showthread.php?t=758769
    OMG! IT WORKS!!! THANKS!!!
    But now i have a problem with the AF. Somehow,i just realised that
    during focus,the motor sounds loud,still,it focuses.. anything wrong with it?

  14. #14
    Senior Member sinned79's Avatar
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    Default Re: 50mm f1.8 focus

    Quote Originally Posted by ley35 View Post
    during focus,the motor sounds loud,still,it focuses.. anything wrong with it?
    this is the known fact for this lens. cos its a motor focusing system not USM. so its ultra noisy.

  15. #15

    Default Re: 50mm f1.8 focus

    don't expect so much on this 50 1.8

    when you have problems with it, the best way is to go to the nearest dustbin and dump it.

    even with warranty, Canon will sure definitely charge you some money, except for calibration. Unless you have a body with micro adjustment.
    Think fast, aim for the best !

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