Canon DSLR

Discussion in 'Beyond the Basics' started by DirtyRat, Jul 30, 2008.

  1. DirtyRat

    DirtyRat TPF Noob!

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    Hello. To start, I like both Canon and Nikon DSLR's. I've found an issue with the "focal" points. I purposely set "focus' using the center focal point for my action photography. Often times I find my subject blurred and objects "behind" in sharp focus. I generally shoot with a wide aperature to gain focus on the subject and a soft background. Much of the background in my images I don't want in-focus, ie. trailers, people, cars, etc.

    Is there a setting I'm missing? I use a 70-200 Sigma f/2.8 and a Canon 50mm f/1.4, of course the kit lens on the Canon 40D.

    Appreciate any help.
     
  2. Mystwalker

    Mystwalker TPF Noob!

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    I think you need to increase shutter speed. Shoot in Tv mode, increase ISO to get faster apperture (this gives you that soft background).

    Or, shoot in Av mode - increase ISO until you get shutter speed that is equal to or greater then max length of lens (200 and 50 in your case). 50 may not be fast enough if your subject is moving fast.

    With the f/1.4, if you are shooting wide open you have to be almost RIGHT ON TARGET. If your subject is moving eratically (toddler), this can be difficult. I stopped using my f/1.8 because I was having trouble keep daughters face in focus @ f/1.8.

    A flash solved my problems :)
     
  3. Buszaj

    Buszaj TPF Noob!

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    What AF mode are you shooting in? It should be servo.
     
  4. Village Idiot

    Village Idiot No longer a newbie, moving up!

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    Or it could be an issue with back focusing. That requires a trip to Canon service.

    Try shooting with AI servo and then try this:

    http://www.focustestchart.com/focus21.pdf

    It's a focus testing chart. Test all your lenses at different apertures and follow the directions. That's one sure fire way to find out whether or not you suck and need to learn tracking/panning/focusing better or that your camera and/or lens(es) suck and need to be sent back for service.
     
  5. DirtyRat

    DirtyRat TPF Noob!

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    It's true that a digital camera needs contrast to focus. Shooting a black horse at night = NO contrast.Thus no focus. At least I know it's not a fault of mine, nor the camera. I have to rely on luck of the shot.
     
  6. gryphonslair99

    gryphonslair99 Been spending a lot of time on here!

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    Post an example with exif data included.
     
  7. davebmck

    davebmck TPF Noob!

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    It's not a matter of luck. If you are consistently getting focus behind your subject you likely have a back focus problem as Village Idiot point out. If thats not it, it is probably your technique. If you didn't have enough contrast or light to focus your autofocus would hunt and wouldn't even get as close as you are getting.

    Also as pointed out before, if your subject is moving towards you, servo focus will help. Try it out.
     
  8. DirtyRat

    DirtyRat TPF Noob!

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    That I never heard of. This is a fault of the lens(es)? How are we to know when buying a lens, that it has that flaw? When they run several thousand dollars for a lens, you'd think you were getting a "good" lens!?

    I shoot in Servo to catch those moving subjects.
     
  9. JerryPH

    JerryPH No longer a newbie, moving up!

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    Post an example with EXIF data intact as suggested. It's all just guessing until we can see what you are talking about.
     
  10. Village Idiot

    Village Idiot No longer a newbie, moving up!

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    It could also be the camera if it is a backfocusing issue. You have to rule out which it is.

    Buy used from a reputable source. That's about it unless you know that the lens you're purchasing is bulletproof. There are some lenses are known to have soft focus, back focus, or other issues...

    Back focusing is just an adjustment that's off though, it doesn't mean what you bought is defective. It's just not calibrate 100% true.
     
  11. Tolyk

    Tolyk TPF Noob!

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    I'm curious, what does liking Canon and Nikon SLRs have to do with your question? ;)
     
  12. Bifurcator

    Bifurcator TPF Noob!

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    He said it's "action photography" and stated "I shoot in Servo to catch those moving subjects"... so, I wonder if he's talking about blur and not actually focus.

    It it IS blur you can pan the cam to follow the target and with a high enough shutter speed >100, the opposite will happen. The BG will be blurred and the subject will be sharp.

    That's different than "focus" though so I dunno. :D
     

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