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FORUMS Photography Talk by Genre General Photography Talk 
Thread started 02 Dec 2015 (Wednesday) 13:54
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POLL: "Do you use back button focus?"
Yes
156
84.3%
No
26
14.1%
What is back button focus?
3
1.6%

185 voters, 185 votes given (1 choice only choices can be voted per member)). VOTING IS FOR MEMBERS ONLY.
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Back Button AF?

 
Dan ­ Marchant
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Sep 14, 2016 00:41 |  #166

The key issue with BBF is that it is continuous when you want it to be and can be stopped when you don't want it. So when shooting a moving subject you keep the button pressed and track the subject. When shooting a stationary landscape you press to focus and then release the button and focus is locked.


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CyberDyneSystems
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Post edited over 4 years ago by CyberDyneSystems.
     
Sep 14, 2016 16:11 |  #167

^ True!

and yet,..

The Key issue with BBF is that I can keep shooting without the camera trying to refocus when I don't want it to, but I can get right back to getting the camera to auto-focusing instantly. Sometimes even in fast action, I don't want the camera to keep trying to re-focus.



... and so on. :)


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snerd
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Sep 14, 2016 22:50 |  #168

That's the way I've always used it.




  
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Dan ­ Marchant
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Post edited over 4 years ago by Dan Marchant.
     
Sep 15, 2016 00:10 |  #169

CyberDyneSystems wrote in post #18128116 (external link)
^ True!

and yet,..

The Key issue with BBF is that I can keep shooting without the camera trying to refocus when I don't want it to, but I can get right back to getting the camera to auto-focusing instantly. Sometimes even in fast action, I don't want the camera to keep trying to re-focus.

I don't understand the "and yet". Your post just said exactly what mine did, while the "and yet" implies some difference which I'm not seeing.


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twists ­ n ­ turns
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Sep 17, 2016 07:15 |  #170

I experimented with this a little while ago, i liked it but ended up missing a couple of good shots, where the subject was out of focus. Think i might have had it on AF-C.
Im guessing it should be on AF-S yes lol?




  
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TerryMiller
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Sep 18, 2016 17:53 |  #171

Dan Marchant wrote in post #18127508 (external link)
The key issue with BBF is that it is continuous when you want it to be and can be stopped when you don't want it. So when shooting a moving subject you keep the button pressed and track the subject. When shooting a stationary landscape you press to focus and then release the button and focus is locked.

CyberDyneSystems wrote in post #18128116 (external link)
^ True!

and yet,..

The Key issue with BBF is that I can keep shooting without the camera trying to refocus when I don't want it to, but I can get right back to getting the camera to auto-focusing instantly. Sometimes even in fast action, I don't want the camera to keep trying to re-focus.



... and so on. :)

I think the difference is that sometimes it's beneficial to not refocus on a moving subject. A bird landing traveling in a direction along the focus plane, for example. The camera will take images at maximum speed rather than trying to reaquire focus between shots since your finger's off the focus button.


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Dan ­ Marchant
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Sep 18, 2016 20:57 |  #172

TerryMiller wrote in post #18132232 (external link)
I think the difference is that sometimes it's beneficial to not refocus on a moving subject.

which was covered by my ....and can be stopped when you don't want it. comment.


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CyberDyneSystems
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Sep 18, 2016 22:17 |  #173

Sorry Dan, I was agreeing with you completely! I was just playing at rearranging the priorities. Sorry if it came off differently.


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the ­ hulk
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Sep 19, 2016 07:51 |  #174

Just set the back button AF and it works but my shutter button is still doing auto focus when pressed half way down. What am I doing wrong here?




  
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Luckless
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Sep 19, 2016 07:52 |  #175

the hulk wrote in post #18132794 (external link)
Just set the back button AF and it works but my shutter button is still doing auto focus when pressed half way down. What am I doing wrong here?

Change the settings for the front focus/shutter button. You can have the AF button enabled for multiple buttons, turning one on doesn't automatically turn others off. Kind of weird, but, eh, flexibility of settings is a good thing.


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the ­ hulk
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Sep 19, 2016 10:44 as a reply to  @ Luckless's post |  #176

Thanks!:-)




  
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dhornick
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Sep 19, 2016 15:58 |  #177

I'm one who answered that it's confusing and rather difficult to use this function but am happy to say I'm a week into forcing myself to stick with it this time and so far so good.


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Sep 19, 2016 16:02 |  #178

The worst thing about BBF is picking up a camera that doesn't have it!




  
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Sep 19, 2016 16:05 |  #179

thc1979 wrote in post #18133440 (external link)
The worst thing about BBF is picking up a camera that doesn't have it!

Or giving your camera to someone to take a shot and forgetting to tell them.


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Wilt
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Post edited over 4 years ago by Wilt. (2 edits in all)
     
Sep 19, 2016 18:54 |  #180

WaltA wrote in post #18133445 (external link)
Or giving your camera to someone to take a shot and forgetting to tell them.


I deliberately forget to tell them...I prefocus using BBF, preset the FL for desired framing, even preset exposure on Manual, and then hand them the camera with suggestion of what part of the background I would like them in capture while retaining us in the frame...they become nothing but an animated remote control.

It increases the chances of getting a desireable shot or two, rather than increased chances of having our heads bullseyed and nothing of the desired background in view!


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Back Button AF?
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