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Thread: Miss Focus With Canon 50mm 1.8

  1. #1

    Default Miss Focus With Canon 50mm 1.8

    Hey guys. So when shooting portraits with my Canon 50mm 1.8 II the focus tend to miss sometimes and be a little off focus.

    I wonder if this has got to do with the extreme shallow DoF or the focusing mechanism in the lens? I'm using a 7D, so the focus shouldn't be all that bad right?

    I'm sure the subject and me are perfectly still when the shots are taken, and I don't focus and recompose. I also make sure to put the focus point on an area with contrast (usually the eye). So is it a fault with the lens? Do any of you guys experience this too?

    Also, I'm wondering if getting a 50 1.4 will help me solve this issue since it uses USM focusing.

    Thanks.
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  2. #2
    Member Irvine's Avatar
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    Default Re: Miss Focus With Canon 50mm 1.8

    in the meantime, why dun u search for a focus test chart in google and test for front/back focus with the 50 f/1.8?
    Google is your friend. Make use of it.

  3. #3

    Default Re: Miss Focus With Canon 50mm 1.8

    Not sure...but I don't face the problem with my copy in general. The main drawback is only the noisy and abit slow focusing speed due to its cheap motor. Why not test on other objects? Again what type of focusing are you using in 7D? Centre pt af? Try centre pt af on other objects to see if the same thing occurs.

  4. #4

    Default

    The 50 1.8 tend to hunt for focus especially when light levels are low.
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  5. #5

    Default Re: Miss Focus With Canon 50mm 1.8

    Quote Originally Posted by Irvine View Post
    in the meantime, why dun u search for a focus test chart in google and test for front/back focus with the 50 f/1.8?
    Did that, the focus seems to be spot on.


    Quote Originally Posted by gundamseed84 View Post
    Not sure...but I don't face the problem with my copy in general. The main drawback is only the noisy and abit slow focusing speed due to its cheap motor. Why not test on other objects? Again what type of focusing are you using in 7D? Centre pt af? Try centre pt af on other objects to see if the same thing occurs.
    I've tried using Single point AF and Spot AF at various points including the center, doesn't seem to help. The misfocusing usually happens when shooting half and full body portraits.


    Quote Originally Posted by Tyrov View Post
    The 50 1.8 tend to hunt for focus especially when light levels are low.
    It doesn't hunt most of the time because I shoot in bright daylight, only misses.


    Wondering if the 50 1.4 performs better in focusing with the Micro USM? Or will it just focus faster?

  6. #6

    Default Re: Miss Focus With Canon 50mm 1.8

    Quote Originally Posted by Doctor Inferno View Post

    It doesn't hunt most of the time because I shoot in bright daylight, only misses.


    Wondering if the 50 1.4 performs better in focusing with the Micro USM? Or will it just focus faster?
    I see. Sorry, can't help you there.
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    Senior Member madmartian's Avatar
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    Default Re: Miss Focus With Canon 50mm 1.8

    Alamak! I thought there's a XMM by the name of Miss Focus holding a canon lens.................................... ....................................................
    Take the shot!

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    Default Re: Miss Focus With Canon 50mm 1.8

    Doctor, what f number do you shoot the portraits at? Did you open all the way up to 1.8?
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  9. #9

    Default Re: Miss Focus With Canon 50mm 1.8

    I have the same issue with the 50, on my 7D.

    Problem lies with the lens, not body because the micro motor is not well damp like the USM. Hence, the lens tend to under/over-commit itself when focusing.

    I sent my 50 for calibration but it did not help. I can't be bothered anymore since it's cheap.

    I never have any issue with my 17-55 and 10-22, my previous 85 also worked very well with my 7D.

  10. #10

    Default Re: Miss Focus With Canon 50mm 1.8

    use manual focusing.

  11. #11

    Default Re: Miss Focus With Canon 50mm 1.8

    Quote Originally Posted by madmartian View Post
    Alamak! I thought there's a XMM by the name of Miss Focus holding a canon lens.................................... ....................................................
    lol! Sorry to disappoint you! Hahaha


    Quote Originally Posted by LifeInMacro View Post
    Doctor, what f number do you shoot the portraits at? Did you open all the way up to 1.8?
    Usually at about f/2.0 most of the time.


    Quote Originally Posted by tecnica View Post
    I have the same issue with the 50, on my 7D.

    Problem lies with the lens, not body because the micro motor is not well damp like the USM. Hence, the lens tend to under/over-commit itself when focusing.

    I sent my 50 for calibration but it did not help. I can't be bothered anymore since it's cheap.

    I never have any issue with my 17-55 and 10-22, my previous 85 also worked very well with my 7D.
    Ah... I see. Gets really irritating sometimes when it happens. Time to consider the 1.4 then.


    Quote Originally Posted by Sgdevilzz View Post
    use manual focusing.
    The DoF gets way too shallow for me to manual focus though.

  12. #12
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    Default Re: Miss Focus With Canon 50mm 1.8

    Yes, problem gets magnified when you shoot at f/2. That's why I resorted to getting the 50mm f1.4 after trying out the f1.8.

    50mm f1.f is a beauty and the USM supports pretty good AF. Certainly a keepsake for many years.


    Quote Originally Posted by Doctor Inferno View Post
    lol! Sorry to disappoint you! Hahaha




    Usually at about f/2.0 most of the time.




    Ah... I see. Gets really irritating sometimes when it happens. Time to consider the 1.4 then.




    The DoF gets way too shallow for me to manual focus though.
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  13. #13
    Moderator daredevil123's Avatar
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    Quote Originally Posted by LifeInMacro
    Yes, problem gets magnified when you shoot at f/2. That's why I resorted to getting the 50mm f1.4 after trying out the f1.8.

    50mm f1.f is a beauty and the USM supports pretty good AF. Certainly a keepsake for many years.
    If the lens last many years that is. 50/1.4's usm is reported to be quite fragile.

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    Default Re: Miss Focus With Canon 50mm 1.8

    Quote Originally Posted by daredevil123 View Post
    If the lens last many years that is. 50/1.4's usm is reported to be quite fragile.
    Fragile? I've been using the 50mm f1.4 for quite a while and no USM problems whatsoever...maybe I'm pretty lucky.
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    Moderator daredevil123's Avatar
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    Default Re: Miss Focus With Canon 50mm 1.8

    Quote Originally Posted by LifeInMacro View Post
    Fragile? I've been using the 50mm f1.4 for quite a while and no USM problems whatsoever...maybe I'm pretty lucky.
    Well, hope it doesn't happen to you.

    One of the many complaints online about this lens.
    Flickr: Discussing AF problem in Canon 50mm f/1.4 USM.

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    Default Re: Miss Focus With Canon 50mm 1.8

    Quote Originally Posted by daredevil123 View Post
    Well, hope it doesn't happen to you.

    One of the many complaints online about this lens.
    Flickr: Discussing AF problem in Canon 50mm f/1.4 USM.
    Thanks. I should count my blessings in that case. Anyway, I'm not so hung up about gears and equipment so I usually don't look out for discussion threads like that; if it's broken, I'd just get it fixed or keep it if it is not repairable...and life moves on...there are more important things to do.
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  17. #17

    Default Re: Miss Focus With Canon 50mm 1.8

    which focusing screen are u using?

    there shd be 3 focusing screens from canon , in which one is optimized for f2.8 apertures or larger.... for better AF on centre af point , i think

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