40D focusing issues

Discussion in 'Canon' started by trx125, Jan 17, 2013.

  1. trx125
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    trx125 New Member

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    I was wondering if you think there is a focus issue with this picture. This is one of the better ones my camera has produced since I got it. Thanks for your input!

    EOS D60 in focus
    $CRW_0038a.jpg

    EOS 40D soft focus?
    $11613sam 057.jpg
  2. trx125
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    trx125 New Member

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    The first picture is from my D60 w/ 70-300 IS USM. Second picture is center focus point on the coffee cup at the word Latte with 40D and same lens.
  3. Dao
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    Dao Well-Known Member

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    From the text, it seems like motion blur to me. The text blur more horizontally. If it is out of focus, it should be all around.


    Based on the ExIF data, 300mm with slow 1/6 shutter speed seems to be the issue even with IS turn on.



    Lens: EF70-300mm f/4-5.6 IS USM
    Focal Length: 300mm
    Aperture: f/5.6
    Exposure Time: 0.167 s (1/6)
    ISO equiv: 400
  4. TrentGillespie
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    TrentGillespie New Member

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    As Dao said, it's slight motion blur causing for a soft picture. You can see it in the text, and the small bokeh circles on the pens. The lens camera moved down and to the right just a slight bit. Increase your shutter speed, or get your camera locked down on a tripod.
  5. cloudyview
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    cloudyview New Member

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    exactly what they said.

    first shot was at 120mm, F/22, 1/200s, ISO1000, and your flash fired

    Second was at 300mm, F/5.6, 1/6s, ISO400 and no flash

    The old rule of thumb for shutter speed was 1/focal length if you wanted a crisp hand-held shot. So you would need a shutter speed of around 1/300s in order to keep that completely crisp, if there was no IS. Since the lens does have IS, it does compensate a little bit, it should give you 2-3 'stops' of compensation. For a LOT more info about what that means, click here: http://www.thephotoforum.com/forum/.../205907-shutter-speed-one-stop-intervals.html

    Even with the compensation, you're 2 - 3 stops away from a crisp photo. You could boost the ISO up a bit higher to make up for that as well, but it will increase the amount of noise in the photo.

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