canon rumors FORUM

Technique and Advice => Photography Technique => Topic started by: climber on January 26, 2014, 05:12:15 PM

Title: Focusing
Post by: climber on January 26, 2014, 05:12:15 PM
Hi guys. I saw this video (How To Use AF-On And Back Button Autofocus (http://www.youtube.com/watch?v=FzqQskGoURE#ws)) where that man talk how to use AF-On button on a camera. How much of you use this technique and how usefull is it?
Title: Re: Focusing
Post by: neuroanatomist on January 26, 2014, 05:25:18 PM
I use back-button AF.  Great for birds (bump-focus), useful for focus recompose.  Only downside is if you hand your camera to someone else, but green-square mode cancels back-button AF.
Title: Re: Focusing
Post by: Zen on January 27, 2014, 10:03:17 PM
I use back-button AF.  Great for birds (bump-focus), useful for focus recompose.  Only downside is if you hand your camera to someone else, but green-square mode cancels back-button AF.


Me too!
Title: Re: Focusing
Post by: RustyTheGeek on February 02, 2014, 04:05:27 PM
+1 Ditto.  Only problem is when you hand the camera to someone else.

Otherwise, I got used to shooting this way years ago.  I do quite a bit of low light photography where once I get a focus point sharp, I can shoot several pictures at approx that same distance without losing the focus.  In low light you often run into problems with slow focus hunting so shooting without AF happening with every shot is helpful.
Title: Re: Focusing
Post by: slclick on February 02, 2014, 04:50:43 PM
it's a tough couple of first days but after that you can't go back
Title: Re: Focusing
Post by: climber on February 03, 2014, 03:40:18 AM
But if I put it in AI Servo mode, then there is no "beep" confirmation. How do you make sure that the object is in focus when shooting stationary objects?

PS: I have 5D mk III and as I know there is no option to make a beep confirmation in AI Servo mode.
Title: Re: Focusing
Post by: Viggo on February 03, 2014, 05:30:49 AM
But if I put it in AI Servo mode, then there is no "beep" confirmation. How do you make sure that the object is in focus when shooting stationary objects?

PS: I have 5D mk III and as I know there is no option to make a beep confirmation in AI Servo mode.

You don't need it, it's in focus .. Otherwise you can assign your DOF preview button to switch between Ai and One shot. I don't have any problems shooting stationary subjects with Servo, I have used one shot less than ten shots out of the 70.000 shot with the 1dx and it was the same with the 5d3.

BBF takes a few days to master, but it's not even
Something I think about now, it's automatic.
Title: Re: Focusing
Post by: sagittariansrock on February 03, 2014, 05:36:55 AM
But if I put it in AI Servo mode, then there is no "beep" confirmation. How do you make sure that the object is in focus when shooting stationary objects?

PS: I have 5D mk III and as I know there is no option to make a beep confirmation in AI Servo mode.

You can use the AF point "blink"- set it to show up before focusing and once it is focused. Then it will blink at the moment it is focused.
Title: Re: Focusing
Post by: climber on February 03, 2014, 06:45:41 AM
But if I put it in AI Servo mode, then there is no "beep" confirmation. How do you make sure that the object is in focus when shooting stationary objects?

PS: I have 5D mk III and as I know there is no option to make a beep confirmation in AI Servo mode.

You can use the AF point "blink"- set it to show up before focusing and once it is focused. Then it will blink at the moment it is focused.

I'm not sure but I think that's not possible with AI Servo. Or at least I don't know how to set it.
Title: Re: Focusing
Post by: Viggo on February 03, 2014, 06:52:10 AM
But if I put it in AI Servo mode, then there is no "beep" confirmation. How do you make sure that the object is in focus when shooting stationary objects?

PS: I have 5D mk III and as I know there is no option to make a beep confirmation in AI Servo mode.

You can use the AF point "blink"- set it to show up before focusing and once it is focused. Then it will blink at the moment it is focused.

I'm not sure but I think that's not possible with AI Servo. Or at least I don't know how to set it.

AF menu>AF5>AF Point display during focusing>selected(focused)
Title: Re: Focusing
Post by: jrista on February 03, 2014, 07:42:49 AM
I use back-button AF.  Great for birds (bump-focus), useful for focus recompose.  Only downside is if you hand your camera to someone else, but green-square mode cancels back-button AF.

Ditto! And whenver I hand my camera to someone else, I always take the opportunity to teach them about rear-button AF so they can be cool to.  8)

Personally, though, I remap AF-On and * functions. The * button is vastly more convenient for me as an AF on button. I don't use AE lock all that much, so I assign it to AF-On, which is kind of weird to reach given how it is depressed a little relative to the * button. (BTW, this is on a 7D right now.)

I honestly couldn't live without rear-button AF anymore. I live and die by AI Servo mode...the only times my camera comes out of AI Servo are when I'm doing astrophotography.
Title: Re: Focusing
Post by: Zv on February 03, 2014, 08:24:59 AM
BBF - love it. Once focus is acquired you can sit relaxed and wait for that perfect shot and still be ready if something crosses your path. It's a street shooter's best buddy.

For AI Servo it's a must. You can be constantly tracking something without firing a shot. (Technically the half shutter press method can too but how long can you hold your finger there before it cramps up?).

Oh and you never have to touch the AF/MF switch ever again. It's always in MF until you press the AF-On button.
Title: Re: Focusing
Post by: sagittariansrock on February 03, 2014, 08:03:26 PM
But if I put it in AI Servo mode, then there is no "beep" confirmation. How do you make sure that the object is in focus when shooting stationary objects?

PS: I have 5D mk III and as I know there is no option to make a beep confirmation in AI Servo mode.

You can use the AF point "blink"- set it to show up before focusing and once it is focused. Then it will blink at the moment it is focused.

I'm not sure but I think that's not possible with AI Servo. Or at least I don't know how to set it.

AF menu>AF5>AF Point display during focusing>selected(focused)

+1. That's how to do it. And yes, it still works with AI servo.
Title: Re: Focusing
Post by: cervantes on February 06, 2014, 08:31:48 AM
Hi,

I published an article about Configuring your 5D Mark III AF for fast action.
There is also quite a big section about back-button AF AND a quite different way to use it than most guys do.

You maybe want to check it out!

http://www.dpreview.com/articles/9174241280/configuring-your-5d-mark-iii-af-for-fast-action (http://www.dpreview.com/articles/9174241280/configuring-your-5d-mark-iii-af-for-fast-action)

Greetings!
Title: Re: Focusing
Post by: climber on February 06, 2014, 01:33:51 PM
Hi,

I published an article about Configuring your 5D Mark III AF for fast action.
There is also quite a big section about back-button AF AND a quite different way to use it than most guys do.

You maybe want to check it out!

http://www.dpreview.com/articles/9174241280/configuring-your-5d-mark-iii-af-for-fast-action (http://www.dpreview.com/articles/9174241280/configuring-your-5d-mark-iii-af-for-fast-action)

Greetings!

Yes, I saw it. Great article. I have already asked you something about focusing in the other thread.
Title: Re: Focusing
Post by: mackguyver on February 06, 2014, 01:51:07 PM
I use back-button AF.  Great for birds (bump-focus), useful for focus recompose.  Only downside is if you hand your camera to someone else, but green-square mode cancels back-button AF.
Me too!
Me three!  I have so many blurry photos of myself that I actually set C3 to Shutter AF+AE, f/8, Auto-ISO, and other settings to make the shots as idiot proof as possible :)
Title: Re: Focusing
Post by: sagittariansrock on February 06, 2014, 10:16:06 PM
I use back-button AF.  Great for birds (bump-focus), useful for focus recompose.  Only downside is if you hand your camera to someone else, but green-square mode cancels back-button AF.
Me too!
Me three!  I have so many blurry photos of myself that I actually set C3 to Shutter AF+AE, f/8, Auto-ISO, and other settings to make the shots as idiot proof as possible :)

I usually switch to manual, pre focus, pre zoom, set a very small aperture and then give the camera away. Usually works fine.