Back button focus with the 6 d

I can't get the focus of the "back" of my 6 d (AF-ON) button to work.  After you follow the instructions on the Canon Website on how to implement, the right button does nothing.  Auto focus works only with the shutter button.  I have the function set to "P" which I understood to be okay.  Reset the camera to factory would help?  I'd rather not have to send the camera to Canon for repair of a single button.  Case of the unit was bought new and is still under warranty.

Thank you

Glad to hear you got BBF put in place. It takes a bit of practice, but soon becomes second nature for emphasis in this way.

I don't know what you mean by "choice of the AI Servo.

Are you new on Canon cameras and systems development? Just in case you are...

Like most Canon cameras, the 6 d has three modes of automatic update: One Shot, AI Focus and AI Servo.

One Shot is intended for stationary subjects. The update is performed, then stops and locks, and Confirmation of development is given (the Green LED in the viewfinder, red flash of the AF point in the viewfinder, and if it is enabled, the "beep"). If it moves, you or the subject, or if you change the focal length of the zoom, to refocus you must lift the pressure completely on the button update (whether of BBF or a half press of the shutter button), then reapply.

It is very important to remember is when you use a zoom, since most modern are "varifocale" designs that does not maintain focus when the focal length is changed by zooming. If you use only one zoom, you need either: set the focal length first, before focusing. Alternatively, do not forget to refocus after zooming. Or, use instead the AI Servo.

Because development stops and locks after that he is suffering from a sudden, it's a good way if you use a technique of "focus and recompose.

AI Servo is designed for use with moving subjects. In fact, this is the mode to use each time the distance of the photographer and the subject changes for any reason, or if using a zoom and by changing the focal length. HAVE Servo will never block. Constantly, it measures the distance and updates the development, as long as keep you the pressure on the back button or hold down the shutter button depressed half, depending on how you have the camera set up.  HAVE Servo crashes ever, so there is no Confirmation of focus given. You must learn to trust the camera and yourself. It's working properly.

HAVE unusable Servo with the technique of "focus and recompose", except BBF is used. If the shutter button is always activated AF, it will cause the camera to focus elsewhere, when you try to take the picture after the restructuring. However if using BBF, all you have to do is raise the pressure of your thumb on the button to stop the development, allowing the use of AI Servo with "focus and recompose.

HAVE Servo is also ideal for use with zooms varifocale... given that the focus is continually updated the focal length of the lens is changed.

But he can be very good, AI Servo is not quite exact to the One Shot can be. So critical attention, when possible, use One Shot (Note: Live View and separate focusing system used is even more precise, although it is slower.) Much slower on most of the models... 70 D has a new system that improves a little focus Live View).

AI Focus is not actually a mode of development at all. He is supposed to decide for you, the subject is in motion or not and then move to the use as appropriate: One Shot or AI Servo. Frankly, I almost never use this mode. It may be better with the modern, but older cameras I tried it had a delay while the camera was "decide" mode to use, and which led me to miss some shots. Also, I prefer to choose my own mode of development, and since I use BBF, I can just leave my cameras in AI Servo most of the time. The word 'pro' oriented Canon models (1 d series cameras) have even an AI Focus mode. They have just two: One Shot and AI Servo.

There are a few "tweaks" to the AF systems, depending on the camera model, for example to set the priorities for follow-up or the ease with which "distracted" the AF system is if something momentarily intrudes between you and the subject.  Consult your instruction manual for that specific adjustment can be made with 6 d... I don't have so can't tell from experience.

There is a very useful series of three videos on auto focus systems Canon on YouTube, posted by B & H Photo and Rudy Winston of featuring Canon USA... Each video is long about half an hour and the first one is: highly recommended http://www.youtube.com/watch?v=iAx86nblZ2g , watching all three for additional info, even if they are a few years now and don't specifically talk about the focus 6 d system (5 d Mark II and the original 5 d AF systems are quite similar to 6 d, except that they have less than two points and have 6 in option hidden 'help' points available in AI Servo mode).

I hope this helps.

***********
Alan Myers

San Jose, California, USA.
«Market softly and carry a great lens.»
MATERIAL: 5DII, 7D(x2), 50D(x3), some other cameras, various lenses & accessories
FLICKR & REPROGRAPHY

Tags: Canon Camera

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