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Trvlr323 Goldmember  3,318 posts Likes: 1091 Joined Apr 2007 More info Post edited over 4 years ago by Trvlr323. | Sep 21, 2007 09:50 | #1 ... Sometimes not taking a photograph can be as problematic as taking one. - Alex Webb
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SRPhotographic Senior Member  318 posts Likes: 1 Joined Dec 2005 Location: Gainesville, FL More info | Sep 21, 2007 11:03 | #2 Are you in Green Square Mode? It is defaulted to the AF-ON button in Green Square Mode and can't be changed. You can only change it in Tv, M, Av, P, and C123. "There is nothing worse than a sharp image of a fuzzy concept" -Ansel Adams
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PacAce Cream of the Crop  26,900 posts Likes: 40 Joined Feb 2003 Location: Keystone State, USA More info | Sep 21, 2007 11:45 | #3 C.Fn III-2? That's not the custom function you need to set if you want to change the action of the AF-ON button. You have to set C.Fn-IV-1 and/or C.Fn-IV-2. ...Leo
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superdiver Cream of the Crop  9,862 posts Likes: 5 Joined Jan 2006 Location: Ketchikan Alaska More info | Sep 21, 2007 12:32 | #4 What does this CF do? Or allow you to do? 40D, davidalbertsonphotography.com
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PacAce Cream of the Crop 26,900 posts Likes: 40 Joined Feb 2003 Location: Keystone State, USA More info | Sep 21, 2007 12:54 | #5 The 40D has an AF-ON button just to the left of the "*" button. It allows you to use it for focusing just like you can on the previous models by setting C.Fn-4 to 2 or 3 and using the "*" button for focusing. The C.Fn-IV-1 on the 40D is equivalent to C.Fn-4 on the 30D and earlier models. ...Leo
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Sep 21, 2007 15:42 | #6 Which is darn handy when you shoot with the grip installed in portrait mode. Gear List
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Trvlr323 THREAD STARTER Goldmember 3,318 posts Likes: 1091 Joined Apr 2007 More info Post edited over 4 years ago by Trvlr323. | Sep 21, 2007 21:18 | #7 PacAce wrote in post #3978399  C.Fn III-2? That's not the custom function you need to set if you want to change the action of the AF-ON button. You have to set C.Fn-IV-1 and/or C.Fn-IV-2. ... Sometimes not taking a photograph can be as problematic as taking one. - Alex Webb
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mrkgoo Goldmember 2,289 posts Joined Aug 2006 More info | Sep 21, 2007 22:03 | #8 nqjudo wrote in post #3981804 Leo - Refer to page 158 of the user manual. Custom function III - 2 "Lens AF stop button function". You can change the AF-ON button from the default action to various other actions such as switching from one shot to AI servo and back, changing from auto select of focus points to manual select, etc. There are 6 different functions for the button (0-5). As stated previously, my button will not change functions no matter what CF mode I select. SPR - Definitely not in full auto mode, thanks. Page 158 also says, "The AF Stop button is provided only on super telephoto IS lenses"
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PacAce Cream of the Crop 26,900 posts Likes: 40 Joined Feb 2003 Location: Keystone State, USA More info | Sep 21, 2007 22:09 | #9 nqjudo wrote in post #3981804 Leo - Refer to page 158 of the user manual. Custom function III - 2 "Lens AF stop button function". You can change the AF-ON button from the default action to various other actions such as switching from one shot to AI servo and back, changing from auto select of focus points to manual select, etc. There are 6 different functions for the button (0-5). As stated previously, my button will not change functions no matter what CF mode I select. SPR - Definitely not in full auto mode, thanks. As Mrkgoo said, the AF Stop button is the button that's on the super telephoto lenses like the 300 f/2.8 and higher. That function is not referring to the AF-ON button that's on the camera. ...Leo
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ANGUS Cream of the Crop  6,897 posts Joined Apr 2007 Location: Sydney, Australia... More info | Sep 21, 2007 22:29 | #10 Is there any way to focus with the normal shutter button in live veiw on the 40D thats all that anoys me. Angus
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Trvlr323 THREAD STARTER Goldmember 3,318 posts Likes: 1091 Joined Apr 2007 More info Post edited over 4 years ago by Trvlr323. | Sep 22, 2007 19:28 | #11 mrkgoo wrote in post #3982070 Page 158 also says, "The AF Stop button is provided only on super telephoto IS lenses" Do you have one of these "super telephoto IS lenses" with an AF Stop button? ... Sometimes not taking a photograph can be as problematic as taking one. - Alex Webb
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