question about the canon 18-55 kit lens

Discussion in 'Digital Discussion & Q&A' started by robertwsimpson, Aug 14, 2009.

  1. robertwsimpson

    robertwsimpson No longer a newbie, moving up!

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    Do you guys who have this lens think that it's pretty much always just a tad bit out of focus? It just seems like I can never get a perfectly sharp picture with this lens no matter how hard I try. Wondering if I'm the only one. I get great pics with my 55-250 lens, but it has IS and maybe better glass? I dunno. Maybe I just got a dud.
     
  2. bigtwinky

    bigtwinky No longer a newbie, moving up!

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    Can you post up a picture of what you feel you should of had perfect focus on, and include the camera settings and info on the location (lighting and such)?
     
  3. robertwsimpson

    robertwsimpson No longer a newbie, moving up!

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    ok I shot 6 pictures... 3 at the widest aperture, 3 at the smallest, and the wide ones seem much sharper... I don't know if that's because of the faster shutter speed or what, but it's very noticeable, and I see the same thing even when I'm using a tripod.

    All pictures are 100% crops taken at ISO 100, shutter speed, aperture, and focal length listed before each picture.

    1/2000
    5.6
    55
    [​IMG]

    1/3200
    3.5
    18
    [​IMG]

    1/3200
    4.5
    31
    [​IMG]

    1/80
    29
    31
    [​IMG]

    1/60
    29
    55
    [​IMG]

    1/100
    22
    18
    [​IMG]
     
  4. Josh66

    Josh66 Been spending a lot of time on here!

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    Try some around f/8-11. That's usually the "sweet spot" - after that, you're going to start getting some diffraction (which will cause it to lose sharpness).
     
  5. double5

    double5 TPF Noob!

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    which focus point was selected?
     
  6. robertwsimpson

    robertwsimpson No longer a newbie, moving up!

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    these are giant crops from pictures centered on the hydrant. I just wanted to include a deeper field for reference. The label should be in focus in every photo.

    by "after that" do you mean higher or lower aperture value?
     
  7. Josh66

    Josh66 Been spending a lot of time on here!

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    Smaller aperture, which is a higher f/#.
     
  8. KmH

    KmH Helping photographers learn to fish Supporting Member

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    Check out the image posting sticky at the top of the the Beginners Forum page. They'd like you to resize your images to no more than 800 pixels on the long side before you post them. It saves bandwidth.
     
  9. robertwsimpson

    robertwsimpson No longer a newbie, moving up!

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    unless TPF takes my pictures and re-hosts them, it affects my photobucket bandwidth, not TPF bandwidth. These were posted at full resolution for a very good reason.





    I just went out and took some f8 pictures and they turned out pretty well. I didn't know that shooting at a smaller aperture had that effect. I used to always shoot with a small aperture for whatever reason, so that makes sense that all my pictures were blurry. mystery solved!
     
  10. robertwsimpson

    robertwsimpson No longer a newbie, moving up!

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    lol it doesn't say anything about bandwidth.

    and since the forum automatically resizes images that are too large to see all at once... no harm no foul.
     
  11. Josh66

    Josh66 Been spending a lot of time on here!

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    And you can customize that too. I forget how mine is set up... But it only resizes images that don't fit on my monitor without scrolling, whatever those dimensions are. I used the "2d ruler" widget for Opera to measure it.


    Now - back to the topic.

    You said that they were all 100% crops... If you start looking at everything at 100%, you won't be impressed easily. Even a 'sharp' photo won't look tack sharp at 100%.
     
  12. UUilliam

    UUilliam TPF Noob!

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    Plus your most likely shooting wit ha 1.6x crop sensor, what I tend to do when resizing my images is Long side / 1.6 = new long side (but resize in photoshop so the short side is resized by the same amount)

    This generally makes my image a tad sharper as it removes the x1.6 Magnification that the sensor causes (and I take it to be the 1.6x is a digital zoom?)
     

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