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Old 14th of December 2008 (Sun)   #1
ldevincentis
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Default Al Focus vs Al Servo

New to the group, Hello everybody. I own a Canon 40D and I am wondering what is the difference between Al Servo and Al Focus. One of my favorite subject to shoot is birds and I am wondering if anyone of these setting will help me in my picture taking. thanks
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Old 14th of December 2008 (Sun)   #2
chauncey
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Default Re: Al Focus vs Al Servo

When you link on your question, it will show a series of posts of similar questions.
Reading those, at the lower left, should answer your questions.
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Old 14th of December 2008 (Sun)   #3
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Default Re: Al Focus vs Al Servo

One is mainly for moving objects, ok, so sport is mainly a moving object, but it is unpredictable, this is why we choose AI Servo
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Old 14th of December 2008 (Sun)   #4
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Default Re: Al Focus vs Al Servo

Check page 77 in the manual for a detailed answer. AI Focus is more or less the "auto" mode for focusing type. It will engage AI-Servo if it detects movement in the subject, but otherwise stays with One-Shot.
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Old 14th of December 2008 (Sun)   #5
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Default Re: Al Focus vs Al Servo

AI Focus is for people who enjoy frustration.
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Old 15th of December 2008 (Mon)   #6
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Default Re: Al Focus vs Al Servo

AI Focus is a combination of One-Shot and AI Servo. Unfortunatley it combines the bad points of each.
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Old 15th of December 2008 (Mon)   #7
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Default Re: Al Focus vs Al Servo

AI focus is where the camera tries to guess whether One shot or AI Servo is the best focusing type. Unfortunately, cameras are never as good as humans for deciding this and have a tendancy to get things wrong (addition to Murphy's law - when it does decide to go wrong it will do so in the worst possible way.)

My thoughts for Focus type for birding - AI Servo for Birds in flight, One shot for Birds at rest. Thats certainly the best in my experience with motorsport (not done birding but similar high speed objects)
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Old 28th of February 2010 (Sun)   #8
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Default Re: Al Focus vs Al Servo

so for a concert shooting which is best? AI focus, one shot, or AI servo?
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Old 28th of February 2010 (Sun)   #9
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Default Re: Al Focus vs Al Servo

If there is a lot of movement, AI Servo.

If the artists are fairly static, One Shot.

If you want to be frustrated, AI Focus
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Old 28th of February 2010 (Sun)   #10
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Default Re: Al Focus vs Al Servo

Quote:
Originally Posted by neilwood32 View Post
If there is a lot of movement, AI Servo.

If the artists are fairly static, One Shot.

If you want to be frustrated, AI Focus
Word...
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Old 28th of February 2010 (Sun)   #11
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Default Re: Al Focus vs Al Servo

Quote:
Originally Posted by JeffreyG View Post
AI Focus is for people who enjoy frustration.
Quote:
Originally Posted by hollis_f View Post
AI Focus is a combination of One-Shot and AI Servo. Unfortunatley it combines the bad points of each.
Quote:
Originally Posted by neilwood32 View Post
If there is a lot of movement, AI Servo.

If the artists are fairly static, One Shot.

If you want to be frustrated, AI Focus
All that. AI Focus tries One Shot until it discovers that's wrong, then it goes to AI Servo, just as your subject decides to stop, so it goes back to One Shot as it starts up again and . . . Well, you get the picture.
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Old 28th of February 2010 (Sun)   #12
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Default Re: Al Focus vs Al Servo

Quote:
Originally Posted by Jon View Post
Well, you get the picture.
Umm... no. Actually, you don't.
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Old 28th of February 2010 (Sun)   #13
neilwood32
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Default Re: Al Focus vs Al Servo

Quote:
Originally Posted by SoundsGood View Post
Umm... no. Actually, you don't.
Yeah you get a bundle of blurred frames.
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Old 28th of February 2010 (Sun)   #14
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Default Re: Al Focus vs Al Servo

Quote:
Originally Posted by SoundsGood View Post
Umm... no. Actually, you don't.
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Old 28th of February 2010 (Sun)   #15
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Default Re: Al Focus vs Al Servo

Quote:
Originally Posted by neilwood32 View Post
If there is a lot of movement, AI Servo.

If the artists are fairly static, One Shot.

If you want to be frustrated, AI Focus
That about sums it up. AI Focus is about as useful as Auto AF point selection - letting the camera choose what it wants to do, which often has nothing in common with what you're actually trying to do.
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