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Thread started 23 Mar 2013 (Saturday) 10:36
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AF Technique?

 
cdang
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Mar 24, 2013 23:46 |  #31

I used BBF on my 5D2 for a long time using center only AF, so my thumb wasn't busy doing anything else. Now that I have the 5D3, I use my thumb to move the AF points around a lot so now I'm back at shutter only and prefer it.




  
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dultim8
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Apr 02, 2013 14:28 |  #32

Can someone please explain to me what back button focus is and what the benefits of using it are?
Sorry if this is a numpy question...


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tonylong
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Apr 02, 2013 14:33 |  #33

dultim8 wrote in post #15783509 (external link)
Can someone please explain to me what back button focus is and what the benefits of using it are?
Sorry if this is a numpy question...

"BBF" is where you use a Custom Function to move your AF "activation" from the shutter button to one of the back buttons. Specifics can be configured in another custom function.

The "usefulness" (to those who do use it) is that it allows you to do your AF with your thumb and concentrate on the other functions of the shutter button with your finger. You don't need to worry about accidentally re-focusing with the shutter button.


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dipps
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Apr 02, 2013 14:50 |  #34

dultim8 wrote in post #15783509 (external link)
Can someone please explain to me what back button focus is and what the benefits of using it are?
Sorry if this is a numpy question...

interesting read on the subject
http://www.learn.usa.c​anon.com …ckbutton_af_art​icle.shtml (external link)


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Apr 02, 2013 15:37 as a reply to  @ dipps's post |  #35

Mark II wrote in post #15746565 (external link)
Do you guys AF with the shutter button only?


How many use "Back button" only?

Some might have both in operation on the menu.

Tell us how you focus ... and why ... even if it is Manual.

BBF with AI Servo most of the time. Half press focus when using remote release unless I know that I won't want or need to refocus.


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Apr 02, 2013 15:42 |  #36

^ How do you switch back and forth? I have half press focus set on a custom setting on my 7D dial and I can switch to it when I need to use a remote release button, but I was wondering if there was an easier way.


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CyberDyneSystems
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Apr 02, 2013 15:47 |  #37

Here's a really long read;
https://photography-on-the.net/forum/showthre​ad.php?t=46965


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Preeb
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Apr 02, 2013 16:44 |  #38

Scrumhalf wrote in post #15783858 (external link)
^ How do you switch back and forth? I have half press focus set on a custom setting on my 7D dial and I can switch to it when I need to use a remote release button, but I was wondering if there was an easier way.

Custom is really the only reasonable way.


Rick
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oklaiss
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Apr 02, 2013 18:07 |  #39

BBF because its great with ai servo


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dipps
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Apr 02, 2013 18:23 |  #40

CyberDyneSystems wrote in post #15783871 (external link)
Here's a really long read;
https://photography-on-the.net/forum/showthre​ad.php?t=46965

wow, 2004....... been around way longer than I've been aware of the technique..... :lol:


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groundloop
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Apr 02, 2013 18:35 |  #41

BBF all the time here also. When I first read about it I tried it and felt kinda' awkward, but now it just feels natural. Whether I'm using AI Servo or One-shot AF it's convenient to be able to focus and recompose, plus it just seems to work better for shooting sports for all the reasons already mentioned.




  
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dipps
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Apr 02, 2013 23:41 |  #42

i'm going to try the BBF on my 5DIII. while i'm at it, i'm changing the 'set' button to control the ISO settings, and the joystick to control the af point selection. curious to see how this works out for me (seems like it will work very nicely).


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Tom ­ Reichner
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Apr 03, 2013 00:29 |  #43

From one moment to the next, I have no idea if the next thing I shoot is going to be stationary, in motion, or a combination of both. For that reason, I always have my cameras set to AI servo mode, and use back button focus. In fact, of the last 30,000 images I have taken, every single one has been done this way*.

The AI servo / back button combination works equally well for stationary subjects and moving subjects. I do not know of any other AF settings that work so well for both stationary subjects and subjects in motion, so I have not had any reason to change.

*Even when I am using a remote shutter release, I will have pre-set the focus, using AI servo and the back button.


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kin2son
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Apr 03, 2013 01:08 |  #44
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cdang wrote in post #15751932 (external link)
I used BBF on my 5D2 for a long time using center only AF, so my thumb wasn't busy doing anything else. Now that I have the 5D3, I use my thumb to move the AF points around a lot so now I'm back at shutter only and prefer it.

Exactly my experience.

BBF back in 5D2 days as the outer points sucked and focus recompose was the norm.

Now that I have a 5D3, BBF isn't needed anymore.


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jonrmoore
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Apr 03, 2013 02:23 |  #45

BBF


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AF Technique?
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