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FORUMS Photography Talk by Genre General Photography Talk 
Thread started 12 Feb 2013 (Tuesday) 16:29
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Back button focusing - When and why?

 
Oldschool1948
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Apr 26, 2013 21:12 |  #76

Maureen Souza wrote in post #15629350 (external link)
Thank you so much, Tom. I will give it a whirl. Sounds good but I am afraid my 10 year old habits will die hard.:D

When you press the BBF button you have to hold it for a second or two so that AI Servo has time to lock on.


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djrosen
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May 23, 2013 14:33 as a reply to  @ Oldschool1948's post |  #77

In the T4i owners manual it recommends with AI Servo to use Automatic AF point selection and that it initially uses the center point to acquire focus (Page 96). When using BBF with AI Servo, would you still use Automatic AF Point selection or manually select only the center point?

Also in the custom function setup for BBF there are 3 BBF options available (page 297 of the manual). I am taking some pictures of birds both stationary and in flight and I am not sure which would be best for this.

Thank you for your responses.


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D ­ 550D
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May 29, 2013 09:13 |  #78

LV Moose wrote in post #15603574 (external link)
Does pushing the shutter release halfway, have any affect when using the back button? Can you have it depressed halfway in preparation?

I belive half press does Exporsure Lock.


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Luckless
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May 29, 2013 10:09 |  #79

D 550D wrote in post #15978916 (external link)
I belive half press does Exporsure Lock.

Depends on settings. My 7D is currently set up for half press being metering only, but exposure lock would be another function. (At least as far as I can tell. I don't use any of the auto modes often)


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lovemyram4x4
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May 29, 2013 18:30 |  #80

djrosen wrote in post #15960507 (external link)
In the T4i owners manual it recommends with AI Servo to use Automatic AF point selection and that it initially uses the center point to acquire focus (Page 96). When using BBF with AI Servo, would you still use Automatic AF Point selection or manually select only the center point?

Also in the custom function setup for BBF there are 3 BBF options available (page 297 of the manual). I am taking some pictures of birds both stationary and in flight and I am not sure which would be best for this.

Thank you for your responses.

You'd use whatever AF point selection for BBF as you'd use to shutter button AF all that would change is which button starts/stops AF.

As for if you should a single point or use auto selection, most cases it's best to select a single(or expansion if your camera has the feature). BIF with sky as a the background is one of the few times I'd use auto selection because there's nothing else for it try to focus on(that fact that it picks what normally closest and easiest to focus on more often than is not what you want it focus on) that way if you can't track it perfectly and it's moving in/out of the focal plain another point can keep it focus. On my 1dIV I sometimes use 45 point expansion(functions similar to auto selection) for BIF with only sky in the background, it actually lights which point that it's using to focus so I know it's using the correct ones. For busy back grounds(trees, ground, water, etc) I select a single point or one of the smaller expansions(depending on the size of the subject int he frame and how hard it is to track).

I'm not familiar with the T4i manual/menu but what you want to set is for shutter to be meter only and AF-ON(or which ever button you want BBF on) to start AF.

D 550D wrote in post #15978916 (external link)
I belive half press does Exporsure Lock.

Mine are set to half press meter start and * exposure hold(not lock).




  
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nathan549
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May 30, 2013 09:06 |  #81

Does anyone change back to normal focusing? i use BBF and i shoot mainly fashion and portraiture i just find it really comfortable haha. i see no advantage at all of using the regular shutter half press focusing over bbf. So mine is permanently on BBF


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lovemyram4x4
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May 30, 2013 13:12 |  #82

nathan549 wrote in post #15982255 (external link)
Does anyone change back to normal focusing? i use BBF and i shoot mainly fashion and portraiture i just find it really comfortable haha. i see no advantage at all of using the regular shutter half press focusing over bbf. So mine is permanently on BBF

I don't switch back, but I have my custom mode for underwater set so the AF is linked to both, I use BBF to first get focus(prevent inadvertent full press of shutter-which I have a couple reason I don't want that to happen) but if I'm in heavy surge or current I might not be able to keep my distance steady so when I pull the shutter lever it can focus again imediately prior to the shutter action. I don't use AI servo becasue the bodies I use for UW lack focus confirm in that mode.




  
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CyberDyneSystems
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May 30, 2013 13:25 |  #83

nathan549 wrote in post #15982255 (external link)
Does anyone change back to normal focusing? i use BBF and i shoot mainly fashion and portraiture i just find it really comfortable haha. i see no advantage at all of using the regular shutter half press focusing over bbf. So mine is permanently on BBF

I only switch back on the rarest of occasions. ( tethered shooting, If I want to use my Galaxy NoteII to control AF for instance)

I just spent two days with a used camera I thought could not be configured to BBF (I was wrong thankfully) and I have to say, every single shot started with me pressing the * AE Lock button, wondering why it wasn't focusing, and then moving on! Lather Rinse Repeat..


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CyberDyneSystems
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May 30, 2013 13:26 |  #84

We have been doing this before there was even an 'AF-ON' button

Oh yes,. very much so!


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CyberDyneSystems
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May 30, 2013 13:28 |  #85

yogestee wrote in post #15633891 (external link)
Likewise. I use my thumb to scroll through my focus points and change aperture or exposure compensation.

So do I, but this in no way prevents me from using my thumb to focus as well.


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Tom ­ Reichner
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May 30, 2013 13:40 |  #86

CyberDyneSystems wrote in post #15983073 (external link)
So do I, but this in no way prevents me from using my thumb to focus as well.

So true, Jake.

I often see people say that they don't use BBF because they need their thumbs for other things. But as you say, using your thumb to activate the * button does not in any way mean that you can't use it to scroll the wheel dial, or use the joystick. It's not like there is ever a need to do both at precisely the same instant.


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May 30, 2013 13:59 |  #87

CyberDyneSystems wrote in post #15983066 (external link)
I only switch back on the rarest of occasions. ( tethered shooting, If I want to use my Galaxy NoteII to control AF for instance)

I just spent two days with a used camera I thought could not be configured to BBF (I was wrong thankfully) and I have to say, every single shot started with me pressing the * AE Lock button, wondering why it wasn't focusing, and then moving on! Lather Rinse Repeat..

Wait I take it back I do switch back, but rarely. Tethering and remote self portrait(if it's a group I'll just pre-focus and then join).

Tom Reichner wrote in post #15983101 (external link)
So true, Jake.

I often see people say that they don't use BBF because they need their thumbs for other things. But as you say, using your thumb to activate the * button does not in any way mean that you can't use it to scroll the wheel dial, or use the joystick. It's not like there is ever a need to do both at precisely the same instant.

I guess these people can't adjsut anything with the main dial because they need their index finger for AF/meter/shutter.

I do get the small few that are constantly moving AF points around and that's about all they do with their thumb might not like having to move it over to the other button. I can't think of anything I'd be shooting that I'd need to move the AF point that much.

Anyway, I personal have no issue using my thumb to pick an AF point, adjust my aperture, turn Ae hold on, push the set button to change ISO and still focus with it, while at the same also use my index finger to start metering, change shutter, change ISO and actuate the shutter to actually take a photo.




  
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May 30, 2013 15:27 as a reply to  @ post 15603273 |  #88


Plus when someone else uses the camera they wonder what the f*** is going on [/QUOTE
wrote:

=
Plus when someone else uses the camera they wonder what the f*** is going on :lol:

That's the cool part of it. And then you can play the wise guy on them and show them how its' done :D


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May 30, 2013 19:41 |  #89

nathan549 wrote in post #15982255 (external link)
Does anyone change back to normal focusing? i use BBF and i shoot mainly fashion and portraiture i just find it really comfortable haha. i see no advantage at all of using the regular shutter half press focusing over bbf. So mine is permanently on BBF

I have my custom setting for normal focus for when I'm on a tripod with a remote and I need the AF function. Otherwise it's always BBF now.


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nathan549
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May 31, 2013 01:19 |  #90

Preeb wrote in post #15984209 (external link)
I have my custom setting for normal focus for when I'm on a tripod with a remote and I need the AF function. Otherwise it's always BBF now.

I remember when i first started using BBF and i tried to take a photo with a remote. i was trying to work out what was going on and why it wasn't focusing, then it clicked. hahaha :lol:


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Back button focusing - When and why?
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