Approve the Cookies
This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies and our Privacy Policy.
OK
Index  •   • New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear  •   • Reviews
Guest
New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear  •   • Reviews
Register to forums    Log in

 
FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 05 Oct 2009 (Monday) 10:12
Search threadPrev/next
sponsored links
(this ad will go away when you log in as a registered member)

how to set up Back button focusing on a 40D

 
Bardi
Member
Avatar
101 posts
Gallery: 3 photos
Likes: 62
Joined May 2018
Location: Jacksonville, Florida
     
May 21, 2018 11:43 |  #16

This thread has saved my sanity! Thank you to OP for asking this so long ago!


Gear List
Critique welcome. Editing ok. Thanks for looking

  
  LOG IN TO REPLY
amfoto1
Cream of the Crop
10,250 posts
Likes: 79
Joined Aug 2007
Location: San Jose, California
Post edited 4 months ago by amfoto1.
     
May 25, 2018 14:53 |  #17

The 40D was one of the first models to have an AF-On button.

Later models you set up BBF simply by disabling it from the shutter release button (done from the button assignment screen).

However, on the 40D you do it as described in the manual on pg. 160, by changing Custom Function IV-1, Shutter Button/AF-On Button to option 3. This is similar to the "old school" way it was done on earlier models that didn't have the AF-On button.

If you have a BG-E2 or BG-E2N vertical battery grip on the camera, you might want to also Custom Function IV-2, AF-On Button/AE-Lock Button (*) Switch. This swaps the function of those two buttons. The reason it's needed with the BG-E2/E2N is because that grip doesn't have an AF-On button... It only has an AE-Lock (*) button, which you'll need to use to do BBF in the vertical orientation. The reason the BG-E2/E2N doesn't have an AE-Lock button is because it was actually designed for the 20D and 30D, but continued to be used on the 40D and 50D.

But I continue to use the * button for BBF anyway, even on newer cameras and grips that have both it and the AF-On. The reason I do that is because on most of them the * button is larger, more prominent and closer to my thumb... I focus every shot, but only occasionally use AE-Lock. So it just makes more sense to me to use this arrangement... but it's also partly out of habit because I've been using BBF with the * button since my film days with EOS-3 and Elan 7, as well as on every Canon DSLR I've used.

No one has asked, but FYI, both metering and image stabilization start when you press EITHER the shutter release or the back button (whichever you choose to use for BBF). The only thing BBF setup does is remove the focusing function from the shutter release, which in turn allows you to use AI Servo as your default focusing mode. Still can use One Shot, too, if you wish. But with BBF you can do things in AI Servo you can't without BBF... such as focus and recompose. By having BBF and AI Servo as your default mode, you can be ready to shoot both moving and stationary subjects, without having to stop and change the settings of the camera.


Alan Myers (external link) "Walk softly and carry a big lens."
5DII, 7DII(x2), 7D(x2) & other cameras. 10-22mm, Tokina 12-24/4, 20/2.8, TS 24/3.5L, 24-70/2.8L, 28/1.8, 28-135 IS (x2), TS 45/2.8, 50/1.4, Tamron 60/2.0, 70-200/4L IS, 70-200/2.8 IS, 85/1.8, Tamron 90/2.5 Macro, 100/2.8 USM, 100-400L II, 135/2L, 180/3.5L, 300/4L IS (x2), 300/2.8L IS, 500/4L IS, EF 1.4X II, EF 2X II. Flashes, studio strobes & various access. - FLICKR (external link) - ZENFOLIO (external link)

  
  LOG IN TO REPLY
Gregsiem
Goldmember
Avatar
1,024 posts
Gallery: 57 photos
Likes: 3718
Joined May 2008
Location: Toronto
     
May 25, 2018 15:01 |  #18

brantfordbandit wrote in post #8767062 (external link)
i'm curious, why do we need this if it will focus while pressing the shutter half way???

It is to decouple the focus and the shutter activation.
Eg. you want to acquire focus and leave the camera focused at that point. You might then want to recompose and press the shutter button without it trying to focus again.

Another scenario is when you have a busy foreground (eg twigs around a bird) and once you have acquired focus you don’t want to risk the camera trying to focus again (with probably poor results) when you are actually ready to trigger the shutter.


_____________
Greg
7D II / 10-22 / 85 / 100-400L / Sigma 150-600 C / 430 EX II
flickr (external link)

  
  LOG IN TO REPLY
apersson850
Cream of the Crop
Avatar
11,849 posts
Likes: 215
Joined Nov 2007
Location: Traryd, Sweden
     
May 27, 2018 14:16 |  #19

Whether to use AF-ON or * to focus is your preference. I frequently use both, with different presets for the AF-ON and * buttons.
By the way, on my cameras the AF-ON is larger than the * button.


Anders

  
  LOG IN TO REPLY
sponsored links
(this ad will go away when you log in as a registered member)

17,741 views & 2 likes for this thread
how to set up Back button focusing on a 40D
FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
AAA
x 1600
y 1600

Jump to forum...   •  Rules   •  Index   •  New posts   •  RTAT   •  'Best of'   •  Gallery   •  Gear   •  Reviews   •  Member list   •  Polls   •  Image rules   •  Search   •  Password reset

Not a member yet?
Register to forums
Registered members may log in to forums and access all the features: full search, image upload, follow forums, own gear list and ratings, likes, more forums, private messaging, thread follow, notifications, own gallery, all settings, view hosted photos, own reviews, see more and do more... and all is free. Don't be a stranger - register now and start posting!


COOKIES DISCLAIMER: This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies and to our privacy policy.
Privacy policy and cookie usage info.


POWERED BY AMASS forum software 2.1forum software
version 2.1 /
code and design
by Pekka Saarinen ©
for photography-on-the.net

Latest registered member is letslivep
794 guests, 370 members online
Simultaneous users record so far is 6430, that happened on Dec 03, 2017

Photography-on-the.net Digital Photography Forums is the website for photographers and all who love great photos, camera and post processing techniques, gear talk, discussion and sharing. Professionals, hobbyists, newbies and those who don't even own a camera -- all are welcome regardless of skill, favourite brand, gear, gender or age. Registering and usage is free.