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setting back button focus on Canon 7D

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  • setting back button focus on Canon 7D

    Oy - I've read the instructions over and over and can't seem to figure this out ... I'm in C.Fn.IV-1 and want to use the AF-ON button as my back button autofocus but I only seem to have the option of holding it down to STOP the shutter from autofocusing ... can I set it to BE the autofocus separate from the shutter without having to continuously hold the button?
    http://untamednewyork.smugmug.com/

    Canon 7D; Canon Rebel XSi; Tamron 18-270; 50mm 1.4; Canon 400mm 5.6, Canon 100mm Macro, Sigma 10-20mm, Speedlight 580EX - and the list keeps growing
    [/SIZE]

  • #2
    If I'm reading your question correctly, the answer is "yes." I'm not sure what you've tried yet, but this is what I just did with mine. Enter C. Fn. IV-1 as you stated above, and press the SET button on the back. This will take you to a screen where you can scroll through all the different buttons and select what you want them to do. Go to the AF-ON button and select that one (press SET button). You will have 5 different options to select. I don't even remember what the default is for this but select the first one for AF.

    This should make it so all you have to do is press that button to engage the autofocus. If you are in one shot mode that should be all you have to do to autofocus the lens. If you are in AI servo mode, it will continuously focus as long as you hold the button down.

    Sorry I don't have any graphics here to go along with this. Let me know if I misread or misunderstood your question.

    Hope this helps.

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    • #3
      Thanks! I will try this when I get home. I also thought you could assign different functions to different buttons but I can't figure that out either ... I miss my Nikkormat ....
      http://untamednewyork.smugmug.com/

      Canon 7D; Canon Rebel XSi; Tamron 18-270; 50mm 1.4; Canon 400mm 5.6, Canon 100mm Macro, Sigma 10-20mm, Speedlight 580EX - and the list keeps growing
      [/SIZE]

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      • #4
        You're welcome. Hope it works out the way you want it to.

        I think you'll find the 7d is VERY flexible in it's assignments of functions to the different buttons, scroll wheels, etc. That one menu, once active, will allow you to scroll through all the different buttons and wheels on the camera, show you exactly which button that is with the with onscreen graphic, and display all the different functions available to be assigned to that button or wheel. At one point I reassigned the DOF preview button to a one shot autofocus drive change between one shot and AI Servo. That is, if I was in AI servo but wanted to lock on something and quickly reframe without changing the lens focus, I would just press the little DOF preview button (function reassigned), focus, reframe, shoot, let go of the button, and go back to doing things the way I was before; a little cumbersome but works effectively. I think I also disabled the autofocus function of the shutter button in order to have the ability to keep my finger pressed halfway to meter, and rely on backfocus only for the autofocus.

        Anyway - I think you will find enough flexibility in the button assignments that you will be able to tell the camera to do pretty much anything you want it to.

        Have fun
        Last edited by mrteacherdude; 11-10-2011, 03:17 PM.

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        • #5
          If you haven't figured it out already, here is the tutorial from Canon. I have a 7D and it worked for me, and I would never go back!

          Canon DLC: Article: Back-Button Auto Focus Explained
          photog1107

          www.1107photography.wordpress.com...7D Canon user: nature, travel, landscapes, portraits, sports--so many images, so little time...

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          • #6
            Is there a way to maintain the focus function on your battery grip shutter release button if you choose back button focusing for your AF-ON button? I'd still prefer my shutter release on my batter grip to initiate both focus and exposure metering.
            Dennis
            Canon 50D, 7D
            http://www.flickr.com/photos/dlthibo/

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            • #7
              Originally posted by dlthibo View Post
              Is there a way to maintain the focus function on your battery grip shutter release button if you choose back button focusing for your AF-ON button? I'd still prefer my shutter release on my batter grip to initiate both focus and exposure metering.
              Dennis, it seems that no-one wants to answer your question, but the short answer is "no!" Changing the assignment of the AF-On button will affect both the button on the camera body as well as the button on the grip. Quite honestly, I think it would be very confusing to not have them assigned to the same function, especially when working under pressure. Back button focus has to become instinctive. I don't use the AF-On button for back button focus, I use the * (AE Lock) button as it is more prominent on the 7D and falls more naturally under my thumb. It is also possible to register a different AF start point in the viewfinder for horizontal and vertical orientations.

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