AI servo and AF Point

Started May 18, 2011 | Discussions
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adonetok Forum Member • Posts: 61
AI servo and AF Point

After using Canon 60D for more than a month, I found out that in order to get sharper photo, AI Servo is the best choose but for AF point, I still not sure how to chose the best option: center or auto.
Help need.

Dannyboy292
Dannyboy292 Contributing Member • Posts: 700
Re: AI servo and AF Point

I tend to use center because auto seem to choose the closest thing to you to focus on and you may not want that if your trying to focus on sometong off in the distance.
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Don Madson Regular Member • Posts: 205
Re: AI servo and AF Point

Center point, certainly. With Auto, it might choose something NOT at the center of your attention. I shoot cycling competitions, and always use center-point.

Regards!
Don
--
T'ai Chi Chuan...Relaxation, with an attitude!
http://www.dmadson.photoreflect.com

007peter
007peter Forum Pro • Posts: 10,389
Center- because AI Servo is only "activated" in the center 1st, then

Most people do not know this about Canon AI Servo:

  • AI Servo REQUIRED that you start tracking in the CENTER-POINT 1st!

  • then as your subject moves off-center, the camera will follow it

Many people makes the mistake of initiating AI SERVO when the subject isn't in the center. As the result, 50-70% of the image is out of focus, because the camera wrongly track the initial center-object rather than your actual subject.

Only Canon 7d + Mark1 series can initiate AI SERVO in off-center position. That is why professional sports shooter doesn't bat an eyes upgrading their 40d/50d to a 7d. 7D is an huge advancement in AI SERVO tracking over 20d/30d/40d/50d/60d.

See this canon video for explanation:

adonetok wrote:

After using Canon 60D for more than a month, I found out that in order to get sharper photo, AI Servo is the best choose but for AF point, I still not sure how to chose the best option: center or auto.
Help need.

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Dannyboy292
Dannyboy292 Contributing Member • Posts: 700
Re: Center- because AI Servo is only "activated" in the center 1st, then

nobody is talking about the 7D, its a discussion about the 60D.
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jitteringjr Veteran Member • Posts: 3,375
Re: AI servo and AF Point

If the subject is moving - use AI servo.
If the subject is stationary, use One shot.

Center point is the best option to use if you want you subject in the center of the frame. If you want to follow the rule of thirds and plan to use center point and recompose, then well that is not good technique. Do be mindful of Peter's comment about starting with AI servo using center point.

Watch the Rudy Winston Video series on EOS auto focus. It is a 3 part series. hopefully this link will work for you. If not Google "Rudy Winston A Look at the Canon autofocus system".

http://www.video.bhphotovideo.com/?fr_story=023e7711fd0a11717179bc933084e559429d297d&rf=bm

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aVolanche Veteran Member • Posts: 3,646
Re: Center- because AI Servo is only "activated" in the center 1st, then

Here is the best AF discussion video I have seen (by Rudy Winston fron Canon):

http://www.video.bhphotovideo.com/?fr_story=a2b001b4009876d9c3ede34353cb6af0c193bc8f&rf=sitemap

Three parts

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jitteringjr Veteran Member • Posts: 3,375
Re: Center- because AI Servo is only "activated" in the center 1st, then

aVolanche wrote:

Here is the best AF discussion video I have seen (by Rudy Winston fron Canon):

http://www.video.bhphotovideo.com/?fr_story=a2b001b4009876d9c3ede34353cb6af0c193bc8f&rf=sitemap

Three parts

That's funny - beat ya.

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007peter
007peter Forum Pro • Posts: 10,389
Re: Center- because AI Servo is only "activated" in the center 1st, then

Dannyboy292 wrote:

nobody is talking about the 7D, its a discussion about the 60D.

Do you not READ ENGLISH? Here I'll highlight it for you.

I wrote " Center - because AI......."

I answer the original's poster's Question about CENTER or ALL POINT in 60d.
My answer is CENTER.

I then follow by giving him a technical explanation why CENTER works better with 60d.

You merely mention that center seem to work for you without explanation.

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aVolanche Veteran Member • Posts: 3,646
Re: Center- because AI Servo is only "activated" in the center 1st, then

jitteringjr wrote:

aVolanche wrote:

Here is the best AF discussion video I have seen (by Rudy Winston fron Canon):

http://www.video.bhphotovideo.com/?fr_story=a2b001b4009876d9c3ede34353cb6af0c193bc8f&rf=sitemap

Three parts

That's funny - beat ya.

That's what I get for typing one-fingered! It's a great series.

Fred

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Dannyboy292
Dannyboy292 Contributing Member • Posts: 700
Re: Center- because AI Servo is only "activated" in the center 1st, then

Looks like you were mentioning the 7D to me

Only Canon 7d + Mark1 series can initiate AI SERVO in off-center position. That is why professional sports shooter doesn't bat an eyes upgrading their 40d/50d to a 7d. 7D is an huge advancement in AI SERVO tracking over 20d/30d/40d/50d/60d.

-

  • select Video #1: Automatic AF point Selection

  • fast forward to 49sec out of 2:24

  • you will understand why canon 7d is such an amazing upgrade

adonetok wrote:

After using Canon 60D for more than a month, I found out that in order to get sharper photo, AI Servo is the best choose but for AF point, I still not sure how to chose the best option: center or auto.
Help need.

-- hide signature --

Birdman50 Contributing Member • Posts: 833
It depends ...

I use all 9 Points Active (Auto) with AI Servo for BIF where the background is not so busy:

Some samples:

I then switch to Center Point Only with AI Servo for sports or shots where the background is contrasty:

The 60D is an awesome value for it's performance and capabilities. All you need to do is practice with it and use the correct AF feature when the situation calls for it.

Good luck!

Bobby K.

adonetok wrote:

After using Canon 60D for more than a month, I found out that in order to get sharper photo, AI Servo is the best choose but for AF point, I still not sure how to chose the best option: center or auto.
Help need.

-- hide signature --

To God be all the Glory!

RLH1861 Senior Member • Posts: 1,828
can anyone clarify something for me?

when you say start with CENTER, do you mean with all 9 (on my 40D) points lit up and the point the center on the subject, or doyou mean light up the center point only. I was informed long ago when taking tennispics to use all 9 and let the camera choose. And it seemed to work. However, in this month;s Pop Photo they recommended using center only for sjhooting whaliesin alaska. Since I am going there next month I am very curious.

-- hide signature --

RLH

007peter
007peter Forum Pro • Posts: 10,389
some clarificaiton

RLH1861 wrote:

when you say start with CENTER, do you mean with all 9 (on my 40D) points lit up and the point the center on the subject, or doyou mean light up the center point only.

Take a closer look at the VIDEO linked above for more detail explanation. It means that in order for Canon 20d/30d/40d/50d/60d AI SERVO to tract focus correctly :

  • You need to framed your subject in the dead CENTER first

  • This tell the camera here is my subject that I want to track/follow

  • then as your subject (birds, people) moves about, the camera will followed

If you don't put your subject in the center first,

  • the camera often get fooled and track the wrong subjects

  • this happen quite frequently in high contrast background

Correction: Canon 9 points AF do not show active AF points during AI SERVO

This is one of my main beef as you have no way to tell which points canon dslr is selecting during shooting. Nikon, on the other hand, will show the active black boxes while it tracks the subject. Canon 7D's improve AF also does this, but you have to enable it in the custom setting.

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007peter
007peter Forum Pro • Posts: 10,389
Best Shot I'd seen in a long time!

Birdman50 wrote:

Pure Excellence! Best action shot I've seen here in this forum. What lens?

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imqqmi Veteran Member • Posts: 8,624
Re: It depends ...

Good advice! In addition to even background situations, if the subject moves eratically or there's lots of wind center af point may have trouble staying locked to the subject. All af point ai servo may do a better job but it does seem a bit slower, at least on a 40D. I prefer to use center point only and resort to all af points when necessary even on a 7D.

Birdman50 wrote:

I use all 9 Points Active (Auto) with AI Servo for BIF where the background is not so busy:

Some samples:

I then switch to Center Point Only with AI Servo for sports or shots where the background is contrasty:

The 60D is an awesome value for it's performance and capabilities. All you need to do is practice with it and use the correct AF feature when the situation calls for it.

Good luck!

Bobby K.

adonetok wrote:

After using Canon 60D for more than a month, I found out that in order to get sharper photo, AI Servo is the best choose but for AF point, I still not sure how to chose the best option: center or auto.
Help need.

-- hide signature --

To God be all the Glory!

-- hide signature --
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