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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 25 Nov 2012 (Sunday) 09:32
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7D and Back Button AF

 
jaxhouse
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Nov 25, 2012 09:32 |  #1

I've recently started using back button AF....trying to get used to it and have a question.

When using back button AF will a shutter release still behave the way it always did, with a half press focusing, then activating the shutter with a full press?


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mrsekret
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Nov 25, 2012 09:54 |  #2

It does on my 5d mkiii so I would think it would on your 7d.




  
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Wallace ­ River
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Nov 25, 2012 09:54 |  #3

No, it won't, as you wll have transferred all focus work to the back button. The shutter release button becomes responsible for light metering and then the shutter release only If you're taking a still image in single shot mode, you use the back focus button to focus, get your confirming beep, then hit the shutter lease for metering and taking the shot. If in AF Servo, you just keep your finger on the back button to keep focus, and then the shutter release will meter and take the shot.


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JohnB57
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Nov 25, 2012 09:57 |  #4

Wallace is correct but for clarity you have to set it up as a custom function, disabling AF from the shutter release.




  
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mrsekret
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Nov 25, 2012 10:04 |  #5

I stand corrected




  
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jaxhouse
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Nov 25, 2012 10:17 as a reply to  @ mrsekret's post |  #6

Well how would be the best way to set it up since I occasionally use a shutter release?


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saea501
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Nov 25, 2012 10:35 as a reply to  @ jaxhouse's post |  #7

I guess I'll be the dissenter here.....I've tried many times to use back button focus and I just don't care for it. I can move faster and have better results with the camera set up with focus on the shutter release.

At least for me I see no advantage in back button focus. So, of course, my wireless shutter release works just dandy.


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john ­ crossley
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Nov 25, 2012 10:43 |  #8

saea501 wrote in post #15286701 (external link)
I guess I'll be the dissenter here.....I've tried many times to use back button focus and I just don't care for it. I can move faster and have better results with the camera set up with focus on the shutter release.

At least for me I see no advantage in back button focus. So, of course, my wireless shutter release works just dandy.

BBF is primarily for sport/action photography, where you are tracking the subject in the viewfinder. If you are shooting static subjects it is of very little use.


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gonzogolf
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Nov 25, 2012 10:49 |  #9

john crossley wrote in post #15286743 (external link)
BBF is primarily for sport/action photography, where you are tracking the subject in the viewfinder. If you are shooting static subjects it is of very little use.

Not true at all. There are times where you want to separate the metering function from the trigger function. Its also useful for when you want to focus/recompose which admittedly is less often with a 7D than other bodies. It cuts down on the tendency to accidentally refocus during the process.




  
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WaltA
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Nov 25, 2012 10:55 |  #10

gonzogolf wrote in post #15286763 (external link)
Not true at all. There are times where you want to separate the metering function from the trigger function. Its also useful for when you want to focus/recompose which admittedly is less often with a 7D than other bodies. It cuts down on the tendency to accidentally refocus during the process.

+1 for this ^
Used lots in landscape as gonzo suggests to seperate the two functions.


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convergent
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Nov 25, 2012 10:55 |  #11

john crossley wrote in post #15286743 (external link)
BBF is primarily for sport/action photography, where you are tracking the subject in the viewfinder. If you are shooting static subjects it is of very little use.

Agree with this. I use it for sports always. I usually set to half shutter when shooting static subjects. If anyone doesn't see the point in BBF, try shooting competitive volleyball, or other sports with lots of objects blocking your subject sporadically. Being able to separate focus from shutter release is essential.

To the original question, if you still had the half shutter focus with the BBF, you'd loose all advantage in doing it. The point is to be able to turn off AF when you want to, so that your prefocus won't be altered when you hit the shutter release.

Another case where BBF is useful is when you need to recompose a lot and then hold for a long time waiting to take the picture.


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Kaiser_photographer
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Nov 25, 2012 12:50 |  #12

WaltA wrote in post #15286788 (external link)
+1 for this ^
Used lots in landscape as gonzo suggests to seperate the two functions.

^+1, I use BBF on all my cameras, always, for every type of shooting from sports to portraits. Is just a way of working, for me it's great for others it might be not worth.
I believe is Custom Funcion 4 , in option ...... I don't remember it now, but is to assign af-on to focus and metering and shutter button to metering only, and it's set(For the 7D, others cameras will depend on buttons and options on menu).


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flyinlow007
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Nov 25, 2012 13:02 |  #13

I have gotten used to using BBF and use it all the time now. Works great for recomposing, sports, fashion, etc. Used alot in fashion as you always focus on the model's eyes, then recompose.

If you are using a shutter release, you do have to switch it back if you want it to focus and take the shot. Otherwise, just use the AF button to focus, then use your shutter release to meter and take the shot.


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jaxhouse
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Nov 25, 2012 14:18 as a reply to  @ flyinlow007's post |  #14

Thank you all for your replies!

I'm going to keep using the back button AF primarily...I've heard enough positves about it that I'm going try and catch on to using it.

I believe that I'm going to use the camera user setting 1 "C1" on the dial where I could switch to for times when I don't want to use the back-button AF such as when using a shutter release. Anyone else use back button AF and have theirs set that way? Or do you have your Camera user settings, C1,2,3, set differantly?

Thanks again!


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WaltA
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Nov 25, 2012 15:08 |  #15

Kaiser_photographer wrote in post #15287196 (external link)
^+1, I use BBF on all my cameras, always, for every type of shooting from sports to portraits. Is just a way of working, for me it's great for others it might be not worth.
I believe is Custom Funcion 4 , in option ...... I don't remember it now, but is to assign af-on to focus and metering and shutter button to metering only, and it's set.

The reason we have to be careful about the advice we give about BBF is that it depends on the camera model. In my case (5Dc and xTi) I have no AF-ON button. BBF assigns AF to the * button.


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7D and Back Button AF
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