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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 30 Jul 2010 (Friday) 21:22
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back button on 50D?

 
jeljohns
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Jul 30, 2010 21:22 |  #1

I'm really confused as to how to properly use back button focus. I thought I had set it correctly in the custom functions (IV, #2), but it does not focus when I press the * button. I still have to press the shutter halfway for the lens to focus and then I hear the confirmation "beep". I thought the focus was supposed to happen when I press the * button. on #3 neither * or shutter buttons do anything. I read the Canon article but it only confused me more!




  
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TheBurningCrown
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Jul 30, 2010 21:27 |  #2

...you're obviously doing something very wrong.

If it's set correctly the half press of the shutter won't focus at all. Are you sure that you're confirming the changes once you make them?


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jeljohns
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Jul 30, 2010 22:23 |  #3

Ok, I think I figured it out (there is one more setting on 50D to get * button). I've heard two different ways to use it though.......press button to focus then release button. Then just press shutter button. I've also been told you have to hold the button continuously the whole time you shoot. Which is correct?




  
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TheBurningCrown
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Jul 30, 2010 22:26 |  #4

jeljohns wrote in post #10634654 (external link)
Ok, I think I figured it out (there is one more setting on 50D to get * button). I've heard two different ways to use it though.......press button to focus then release button. Then just press shutter button. I've also been told you have to hold the button continuously the whole time you shoot. Which is correct?

Simple. When you press the button it focuses.

If you're in One shot AF, if you press the button and it attains focus, you can either hold the button or let go. It doesn't matter. Then take the picture.

If you're in Servo AF, if you press the button it focuses. Either let go and take the picture, or hold onto the button to keep focusing.

If the image is in focus and you're not tracking anything, why tell the camera to focus?


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itzcryptic
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Jul 30, 2010 23:46 |  #5

* is used for exposure lock

AF-On is the default button for focusing.

They made it so you can switch the functions of the two buttons because the 40D and previous models did not have the AF-On button.




  
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back button on 50D?
FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
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