oredith Senior Member  343 posts Joined Jul 2008 Location: Long Beach, CA More info | Sep 06, 2008 15:19 | #1 i took this this morning with a 70-200 f/2.8L (non-ish):
anyways, lens aside, what is the prefered AF mode for panning and chasing a bird? The nature of the pan will take the bird out of the plane of focus via a curved path. I find that the AF seems to be just a hair behind when set to AI focus. is AI focus better than servo? vs. single shot? kinda confused on exactly what the differences are. Canon 1Dm3 | Canon 7D | Tokina 11-16 | Canon 28-70 | Sigma 50 f/1.4 |Sigma 70-200 f/2.8
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JeffreyG "my bits and pieces are all hard"  More info | Sep 06, 2008 15:24 | #2 AI servo. My personal stuff:http://www.flickr.com/photos/jngirbach/sets/
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Sep 06, 2008 15:26 | #3 I always use AI Servo on my 20D and the MKII only has single shot and AI Servo. My Stuff 1D MK IV, 5D MK IV,1D MK II, 100-400L, 28-70 2.8L, 580EX II, 70-200 2.8L IS,16-35 f4L. www.humphreyimages.net
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2.8orfaster Senior Member 487 posts Joined Aug 2008 Location: On dry land More info | Sep 06, 2008 15:26 | #4  Permanent banWhat is AI focus used for? I have never used it...
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Sep 06, 2008 15:36 | #5 I use center focus point, AI Servo, UZI mode.   R5, RF 85 f1.2L, RF 50 f1.8, 6D, EF16-35 F4L IS, EF50 f1.4, EF 100 f2.8 L Macro IS
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glowie Senior Member  888 posts Joined Feb 2006 Location: NYC More info | Sep 06, 2008 16:11 | #6 beautiful captures strobe! .....::....:..:..:::.::....:::..::....:.:.:::....
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Sep 06, 2008 16:16 | #7 2.8orfaster wrote in post #6254421  What is AI focus used for? I have never used it... If you have a MK II or III it does not have the AI Focus. It is used when a stationary object starts to move closer or farther away from you, AI Focus is supposed to sense that and adjust. My rule of thumb whether doing a wedding or a baseball game if the subject has any possibility of moing I switch to AI Servo. I also have use the center focus with good results. My Stuff 1D MK IV, 5D MK IV,1D MK II, 100-400L, 28-70 2.8L, 580EX II, 70-200 2.8L IS,16-35 f4L. www.humphreyimages.net
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bohdank Cream of the Crop  14,060 posts Likes: 6 Joined Jan 2008 Location: Montreal, Canada More info | Sep 06, 2008 16:31 | #8 AI Servo with all points enabled. The center point is what picks up the focus first and passes it on to the other points, if the target moves off the center point. Bohdan - I may be, and probably am, completely wrong.
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Sep 06, 2008 17:28 | #9 bohdank wrote in post #6254664 AI Servo with all points enabled. The center point is what picks up the focus first and passes it on to the other points, if the target moves off the center point. It always first acquires focus with the center point (this is not user selectable). good info bohdank, I've tried the AI with all points enabled and I like the way it works for baseball and football. My Stuff 1D MK IV, 5D MK IV,1D MK II, 100-400L, 28-70 2.8L, 580EX II, 70-200 2.8L IS,16-35 f4L. www.humphreyimages.net
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RoyC Goldmember  2,088 posts Likes: 21 Joined Aug 2005 Location: N.Devon, UK More info | Sep 07, 2008 02:11 | #10 For birds I use AI Servo all the time, even for perched birds. TOP BIRD SHOTS
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XterraJohn Senior Member 513 posts Joined Aug 2008 More info | Sep 07, 2008 03:24 | #11 bohdank wrote in post #6254664 AI Servo with all points enabled. The center point is what picks up the focus first and passes it on to the other points, if the target moves off the center point. It always first acquires focus with the center point (this is not user selectable). Boy was I having problems with this focus mode before I found out this info. Can you say blurry duck photos?
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2.8orfaster Senior Member 487 posts Joined Aug 2008 Location: On dry land More info | Sep 07, 2008 07:19 | #12 Permanent banDean Humphrey wrote in post #6254599 If you have a MK II or III it does not have the AI Focus. It is used when a stationary object starts to move closer or farther away from you, AI Focus is supposed to sense that and adjust. My rule of thumb whether doing a wedding or a baseball game if the subject has any possibility of moing I switch to AI Servo. I also have use the center focus with good results.
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shoshone Senior Member  More info | Sep 07, 2008 12:06 | #13 XterraJohn wrote in post #6257374 Boy was I having problems with this focus mode before I found out this info. Can you say blurry duck photos?  Course I can...Phurry Bluck Dotos....or should that be Durry Ph*** Blotos..can't remember Sony: A7rii
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RandyMays Senior Member 712 posts Joined Feb 2006 Location: Nebraska More info | Sep 07, 2008 12:15 | #14 AI Focus Stinks ! I convinced myself for the longest time to use this mode. Well, I sucked... I still use single shot for perched birds. AI Servo for BIF. Canon 40D, 5D MK II
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