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Author Topic: Back-Button Focusing on the T2i  (Read 16925 times)

Offline bgray

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Back-Button Focusing on the T2i
« on: August 25, 2011, 08:31:59 PM »
I started back-button focusing on the T2i about a week ago.  I'll never go back.  Much much better.

What is this?
Instead of focusing by pressing the shutter half-way, you move the focus function to the back of the camera...using the "*" button.  So to focus, press the "*" on the back of the camera.  When you want to snap a pic, hit the shutter.

How do you do this?
Turn the T2i on.
Press the MENU button
Select the last tool symbol on the left (woops, I mean right)
Select Custom Functions (C.Fn)
Select Custom Function 9
Highlight OPTION 1 AE lock / AF
Press Set
Press Menu to exit menu

Why do this?
This article says it much better than I can....
http://www.learn.usa.canon.com/resources/articles/2011/backbutton_af_article.shtml

Enjoy - much easier to nail your focus!

Brian
« Last Edit: June 24, 2012, 11:29:25 AM by bgray »
5Dii, T2i, EOS M.  EFM 18-55, EFM 22, 17-40L, Rokinon 8mm Fisheye, 28mm 1.8, 50mm 1.4, 85mm 1.8, 70-300mm 4-5.6, 580EX  http://briangrayphotography.blogspot.com/

Offline Skippy

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Re: Back-Button Focusing on the T2i
« Reply #1 on: August 25, 2011, 08:42:36 PM »
I love this option. I found that a few months back and just like you I could not wait to come and share it. It is kind of like your birthday each time you find a good useful trick isn't it?
I'm an old film guy just playing catchup in this digital world. Help me out.

square root of 2:   f/1, f/1.4, f/2, f/2.8, f/4, f/5.6, f/8, f/11, f/16, f/22, f/32, f/45, f/64, f/90, f/128

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Offline bgray

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Re: Back-Button Focusing on the T2i
« Reply #2 on: August 25, 2011, 08:46:03 PM »
5Dii, T2i, EOS M.  EFM 18-55, EFM 22, 17-40L, Rokinon 8mm Fisheye, 28mm 1.8, 50mm 1.4, 85mm 1.8, 70-300mm 4-5.6, 580EX  http://briangrayphotography.blogspot.com/

Offline LeadinghamPhoto

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Re: Back-Button Focusing on the T2i
« Reply #3 on: August 25, 2011, 08:52:19 PM »
Hmm, after reading that article and looking back on some shoots I've done, I really could have used this. 
A BIG feature would have been the ability to override the autofocus.  Especially when I was trying to capture a dragonfly in mid flight.  I was constantly switching between manual and auto.  He'd land and I'd auto focus on that, then I'd have to switch to mf.  In doing so, many times I bumped the camera and the dragonfly would go out of the frame.   Very useful tool for shooting wildlife.  Many times I just want the eye or part of the head in focus.  But I can use af to get part of the head in focus, then fine tune wiht manual. 
Everytime I've seen this come up, I've really just dismissed it until now.
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Offline SkierBoy

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Re: Back-Button Focusing on the T2i
« Reply #4 on: August 26, 2011, 01:29:21 AM »
I'm so used to pressing the shutter button that I went back. I agree with the advantages of the back button but kept forgetting to focus!

I will try to educate myself again. I can't be the only one who is this stupid surely?
I once prayed to God for a camera, but quickly found out he didn't work that way.... so I stole a camera and prayed for his forgiveness.

CAMERAS - Canon 70D | Canon 550D | Canon Ixus 120 IS | Panasonic FZ7
LENSES - EF 100-400mm L IS | EF 70-200mm f/4 L IS | EF-S 15 - 85mm | EF-S 18 - 55mm | EF-S 55 - 250mm | EF 50mm f/1.8 II prime | EF-S 10-22mm
ACCESSORIES - Manfrotto 190XPROB Tripod | Giotto MML3270B Monopod | YN-465 Flash | Lowepro Fastpack 100 Rucsack
SOFTWARE - Picasa 3 | Photoshop Elements 9 | Photomatix 4.0 | Lightroom 4 with Topaz Plug-ins

Offline Logan.G

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Re: Back-Button Focusing on the T2i
« Reply #5 on: August 26, 2011, 10:27:20 AM »
I like having the option, but I like the setup where if you hold the back button it won't focus a lot more. That way, if I'm already in focus, I hold back while I hit the shutter to actually release it.

Offline ARPhot

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Re: Back-Button Focusing on the T2i
« Reply #6 on: August 26, 2011, 01:30:08 PM »
I can't be the only one who is this stupid surely?

No SkierBoy, you're not the only one. My wife has bestowed many a trophy on me for that acclaim. I have come to accept it. However, my alter ego (a super genius of course) can never be divulged to her or expectations may change in our household. I trust you will keep my secret.

Oh and btw, that's an interesting way to focus. Thanks for sharing bgray!
t2i - tamron 28-80 AF Aspherical - Canon 50mm 1:1.8 II - Quantaray 55-200 - Canon Extension Tube EF12 II
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Offline jdog82

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Re: Back-Button Focusing on the T2i
« Reply #7 on: January 21, 2012, 01:52:28 PM »
I didn't want to revive this topic, but I had to say thank you to the OP!! Since this morning I thought my 50mm 1.4 lens was damaged for sure. I swear I don't remember going to the  Custom Functions (C.Fn) or hitting anything on my camera but it was not AF on any manual mode and I thought it was malfunctioning. There is a Canon Factory down the street (literally), I'm like trying to gather up my kids and go down there and try and figure out what's going on and etc. .... I had been grumpy all day lol and I just happened to come to t2iforum and search for a solution and found this thread! Man I am so relieved. The power of reading and researching. I love this site!!!!!!!!!!

Oh and to the mods, I surely won't do this again if it was a no-no but man I had to post some type of gratitude ;D

Offline Skippy

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Re: Back-Button Focusing on the T2i
« Reply #8 on: January 21, 2012, 03:42:14 PM »
Jdog - there is zero problem bumping a topic let alone a good and very useful one.
I'm an old film guy just playing catchup in this digital world. Help me out.

square root of 2:   f/1, f/1.4, f/2, f/2.8, f/4, f/5.6, f/8, f/11, f/16, f/22, f/32, f/45, f/64, f/90, f/128

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Offline SkierBoy

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Re: Back-Button Focusing on the T2i
« Reply #9 on: January 21, 2012, 03:44:07 PM »
I turned this function back on because your bump reminded me I stopped using it and really really should start again.
I also MUST get Magic Lantern sorted soon too!
I once prayed to God for a camera, but quickly found out he didn't work that way.... so I stole a camera and prayed for his forgiveness.

CAMERAS - Canon 70D | Canon 550D | Canon Ixus 120 IS | Panasonic FZ7
LENSES - EF 100-400mm L IS | EF 70-200mm f/4 L IS | EF-S 15 - 85mm | EF-S 18 - 55mm | EF-S 55 - 250mm | EF 50mm f/1.8 II prime | EF-S 10-22mm
ACCESSORIES - Manfrotto 190XPROB Tripod | Giotto MML3270B Monopod | YN-465 Flash | Lowepro Fastpack 100 Rucsack
SOFTWARE - Picasa 3 | Photoshop Elements 9 | Photomatix 4.0 | Lightroom 4 with Topaz Plug-ins

Offline rpavich

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Re: Back-Button Focusing on the T2i
« Reply #10 on: January 21, 2012, 03:53:29 PM »
One thing that I think is REALLY valuable when using the back-button focus is that you can use "Servo-focus" mode and just keep the back button down and keep snapping away...

Offline Dennis

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Re: Back-Button Focusing on the T2i
« Reply #11 on: January 22, 2012, 03:41:46 PM »
hey guys, just changed settings and it works well. Might sound like a silly question but will the auto tracking still work with any canon telephoto lens using back-button focusing? Cheers.

Offline Skippy

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Re: Back-Button Focusing on the T2i
« Reply #12 on: January 22, 2012, 07:20:17 PM »
hey guys, just changed settings and it works well. Might sound like a silly question but will the auto tracking still work with any canon telephoto lens using back-button focusing? Cheers.
I am guessing that you are using it in Servo mode right? If so then yes it will work the same way with any lens.
I'm an old film guy just playing catchup in this digital world. Help me out.

square root of 2:   f/1, f/1.4, f/2, f/2.8, f/4, f/5.6, f/8, f/11, f/16, f/22, f/32, f/45, f/64, f/90, f/128

Camera simulator. http://www.kamerasimulator.se/eng/?page_id=2

Offline ereuter

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Re: Back-Button Focusing on the T2i
« Reply #13 on: February 07, 2012, 03:36:00 PM »
Just want to thank you guys for this thread.  I've been using BBF for a couple weeks now, and it's like second nature.  I'll never go back!

Offline leoabreu

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Re: Back-Button Focusing on the T2i
« Reply #14 on: February 22, 2012, 01:17:33 PM »
So, if i change the button, where can I lock the exposure?