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DPChallenge Forums >> Tips, Tricks, and Q&A >> 20D focusing
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Showing posts 1 - 13 of 13, (reverse)
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01/17/2006 03:11:39 AM · #1
can someone explain to me the different autofocusing modes on the20D?

AI Servo
AI Focus

Message edited by author 2006-01-17 03:26:26.
01/17/2006 03:23:52 AM · #2
auto and manual I don't think it gets any differenet then that.
01/17/2006 03:28:11 AM · #3
One shot--cam picks a focus spot and stays there
AI Servo--cam tracks movement, with focus spot on center of frame
AI Focus--cam picks a focus spot and stays there, but when it then detects motion it starts to track.

01/17/2006 03:41:14 AM · #4
Originally posted by rgo:

One shot--cam picks a focus spot and stays there
AI Servo--cam tracks movement, with focus spot on center of frame
AI Focus--cam picks a focus spot and stays there, but when it then detects motion it starts to track.


which do you find yourself using the most?
01/17/2006 03:44:36 AM · #5
Originally posted by ShutterPug:

Originally posted by rgo:

One shot--cam picks a focus spot and stays there
AI Servo--cam tracks movement, with focus spot on center of frame
AI Focus--cam picks a focus spot and stays there, but when it then detects motion it starts to track.


which do you find yourself using the most?


Depends on the situation. Taking portraits? Then it's one shot. Candids? Then AI Focus works well. Someone's playing sports? Then servo it is.
01/17/2006 04:42:35 PM · #6
which is the best for basketball? if you sit under the basket. Ive been using servo mode, but i am getting bad photos
01/17/2006 04:49:55 PM · #7
Originally posted by rgo:

One shot--cam picks a focus spot and stays there
AI Servo--cam tracks movement, with focus spot on center of frame
AI Focus--cam picks a focus spot and stays there, but when it then detects motion it starts to track.


thankyou for this, I know I should read more of my manual!!!
But I now know why my firework photographs on new years night were so rubbish I had to delete them all.
01/17/2006 04:59:58 PM · #8
I have problems with my 20D focusing too. Not sure if it's my lense or what. I keep it on AI Focus and my auto focus shots are rarely right. I have resorted to using manual focus most of the time.

One thing I discovered is that you have to watch that dioptric adjuster thingy. I took a bunch of pictures only to find out that it was set wrong and they were all blurry!

Edit: PS, have you tried using burst mode for your basketball shots?

Message edited by author 2006-01-17 17:04:29.
01/17/2006 05:08:23 PM · #9
Originally posted by radionin:

auto and manual I don't think it gets any differenet then that.


uh-oh looks like it's RTFM time.
01/17/2006 05:21:38 PM · #10
That brings to mind a website suggestion. I think they need to make it so that the Update button would reference a page from TFM that would have to be read before being allowed to see my score. Then I would know it by heart.
02/28/2006 07:59:31 PM · #11
Originally posted by greatandsmall:

I have problems with my 20D focusing too. Not sure if it's my lense or what. I keep it on AI Focus and my auto focus shots are rarely right. I have resorted to using manual focus most of the time.



Have you set it to use any focus point it wants, or one deidicated one? I usuually have the center one set as my focal point and have it et to oneshot. Most of what i do is portraiture/weddings. I'd like to rely more on the camera picking the focal point, but I don't trust it to pick the right one LOL. Since i use the center spot and recompose in AI focus the camera often sees that as movement of the subject and gets all pissy with me, often resetting focus the wall or tree etc behind my subject.

I have rarely use AI Servo (using a rebel even with the hack it may not go into this mode in anything but sports mode) - it worked fantastic the one time i used it. Trying to use it all the time failed miserably.


02/28/2006 10:03:54 PM · #12
Ditto on what Prof Fate said on the focus point.

I have it set to center focus point and for the life of me can't remember using anything else. For my off center shots it's One Shot Mode focus in the center and recompose with the cam... (doesn't goof up my metering either).

On drive mode One Shot/AI Servo it's about 50/50 for me. One shot for portraits/Candids and AI Servo for Sports, Birds (big ones (AI Servo and hummingbirds gets a little iffy)) and Action.

I don't use (trust) AI AF as they say it is supposed to detect motion and/or No Motion and change to the proper mode...

From what I have read this is a one (half trigger squeeze) shot deal... If your subject starts out still and moves the cam will switch from Single Shot to AI Servo (we still have a 1/2 shutter release squeeze going) but if your subject stops it will not go back to single shot. Not really sure I will see if I can locate that read.

ED: Omitted word...

Message edited by author 2006-02-28 22:05:39.
02/28/2006 10:31:16 PM · #13
I generally use One Shot, at least when it's in Auto. Usually I'll let auto focus on the point I want, then flip it to manual before actually taking the shot if any motion is involved.

I've been dissapointed a few times using AF Servo; I usually choose a focal point and wait for the subject to enter the zone and click then.
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