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General photography questions and answers: Discuss Af Mode...Can someone explain to me what AF Mode on my canon 450d is for i understand theres three settings but ...
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Old 15-07-2011, 20:26   #1 (permalink)
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Af Mode

Can someone explain to me what AF Mode on my canon 450d is for i understand theres three settings but what they do i dont know fully, i understand AF means auto focus.

So can someone help me please?


Thanks, Liam
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Old 15-07-2011, 20:51   #2 (permalink)
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Re: Af Mode

Not a Canon user, but I guess that there will be a tracking mode for shooting moving subjects, a mode where you can select the focus point the camera uses and one for general use where the camera will use the focus points that are covering the subject.

No doubt a Canon user will be along soon to give the correct information.
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Old 15-07-2011, 20:53   #3 (permalink)
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Re: Af Mode

hope so, thanks aswell, i posted a comment in the photo critique section, about how to add photos and can you let me know here if its quicker?
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Old 15-07-2011, 22:02   #4 (permalink)
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Re: Af Mode

One shot - is for a stationery subject, it allows you to focus, lock it and, if necessary re-frame.

IA servo is for subjects moving toward you or away from you ideally at a constant speed. It will track the subject and re-focus as necessary.

AI focus tries to work out if your subject is moving or stationary and will switch to one shot or AI servo according to which it thinks is the best. AI Focus is generally for people who can't work out the difference themselves HTH.
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Old 15-07-2011, 22:13   #5 (permalink)
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Re: Af Mode

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Originally Posted by SparrowPhotography View Post
hope so, thanks aswell, i posted a comment in the photo critique section, about how to add photos and can you let me know here if its quicker?
Replied to that ages ago.
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Old 17-07-2011, 18:50   #6 (permalink)
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Originally Posted by stepheno View Post
One shot - is for a stationery subject, it allows you to focus, lock it and, if necessary re-frame.

IA servo is for subjects moving toward you or away from you ideally at a constant speed. It will track the subject and re-focus as necessary.

AI focus tries to work out if your subject is moving or stationary and will switch to one shot or AI servo according to which it thinks is the best. AI Focus is generally for people who can't work out the difference themselves HTH.
Thanks for that, really helps i have being yousing AI Focus alot of the time for not knowing what it does, but im taking alot of portraits at my brothers wedding soon and im gussing One shot will be most beneficial


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Old 17-07-2011, 19:01   #7 (permalink)
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Re: Af Mode

Yes I agree, just use One shot. More important is to get your ISO and lighting right for indoor shots. If you get chance have a recce before-hand and try a few test shots.
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