I'm beginning to hate my 28-135mm

Discussion in 'Photography Equipment & Products' started by ga_shooter, Sep 18, 2007.

  1. ga_shooter

    ga_shooter TPF Noob!

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    I have a kit lens, Cannon 28-135mm that has some macro capabilities. In theory its a great all around lens. However I have been having a really hard time getting all the focus points to light up on my 30D. Even in Auto focus it gets it right about 1 out of every 16 tries. Does this sound right? I know its a slow lens, but shouldn't i be able to get better results?
    I am wondering if i should send it in to be fixed, of course if the problem is me that won't help at all...
    These shots are right out of the camera, with just the WB adjusted. How do they look to you guys? I realize they are small, you can see bigger images on flickr.

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  2. DSLR noob

    DSLR noob TPF Noob!

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    I know that if I use my teacher's 20D with it's 18-55 kit compaired to my XT's 18-55 kit mine autofocus much faster and much much more accurately. I have heard Canon makes some kit quality lenses in "good batches" and "bad batches". Let's hope you didn't get a bad batch. Also are you going by final picture or viewfinder image? You'd be surprised how many people have a wrong di-opter setting for their eyes. A test to fix this would be to set the center AF point mount the camera on a tripod(or secure it really well), look at a sheet of white paper on a black background, autofocus on the line of contrast and look at the LCD. If it appears perfect, adjust your diopter until the line is as fine as can be in your viewfinder. this might be a fix to your accuracy problem, but shouldn't have anything to do with the speed of AF.
     
  3. I only ever use a single center focus point. I find the multiple focus points get in my way.
     
  4. ga_shooter

    ga_shooter TPF Noob!

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    Ok, its late, but i am going to do this first thing in the morning. Thanks for the advice. If i have a bad batch lens i am sure that canon will do right by me!
     
  5. ga_shooter

    ga_shooter TPF Noob!

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    Really? What do you shoot most often, landscapes or people?
     
  6. Sideburns

    Sideburns TPF Noob!

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    I do it as well. You only really need one focus point anyways...

    Just hold it half way on what you are focusing on...until it locks in focus. Then you can frame the shot however you want.

    It's much faster, and it doesn't have to guess what you're focusing on.
     
  7. DSLR noob

    DSLR noob TPF Noob!

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    Custom function #4 is a savior. AE Lock /AF lock. You push * to autofocus and then hold the shutter button halfway to get your exposure, compose as you like and shoot. Saves a load of shutter release time if you are going to be shooting a subject that doesn't need refocusing between shots. With this technique, you really DO only need 1 AF point.
     
  8. soylentgreen

    soylentgreen TPF Noob!

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    Unless I shoot a flat wall, I have never got all of the focus points to light up. I just generally use selective focus to compose my images. On rounded objects like you are taking, the DOF may prevent all of the points from focusing. The slight angle of the nameplate may also be doing the same. Like Iron, I use the center point and go from there.
     
  9. Garbz

    Garbz No longer a newbie, moving up!

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    Single shot or continuous servo. I've never been able to get a single shot autofocus picture sharp without tripod and still subject. When macroing I always reach for the manual focus and sometimes CS autofocus.
     
  10. ga_shooter

    ga_shooter TPF Noob!

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    Ok, I get that its not necessary to get what i am looking for. I was out this morning with me 10-22mm shooting landscapes though, and it focused sharp from edge to edge!
     
  11. The Phototron

    The Phototron TPF Noob!

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    Cause wider lens have more death of field.
     
  12. sabbath999

    sabbath999 No longer a newbie, moving up!

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    I don't have a Canon, but i can tell you I only use a single focus point as well... I shoot mostly critters and sports, many times they are quickly moving.

    Also, when shooting macro, I ALWAYS focus manually...

    AutoFocus/AutoExposure locks are my best friend.
     

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