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Thread started 14 Sep 2008 (Sunday) 23:09
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AF Servo on 20D

 
The ­ Fox
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Sep 14, 2008 23:09 |  #1

Hello again everyone, I have a question about the AF servo on my 20D.

Today I was shooting a dog show that had a choreographed Frisbees being thrown and the dogs catching them. I had my old 35-105mm push pull lens on the 20D. I was using servo, 400ISO in noon day sun with shutter speeds of 1/1000th-1/8000th, and F5.6 for a little depth of field. I was also using the center AF point only. Anyways, I got home today and looked over the shots, I got only 40% or so of the shots with perfect focus. Anyone know if it would be the lens' AF motor (old arc-form drive) or could it be something else?

I know that the ones that are focused on the background my fault, but the ones that looked focused in the screen did not come out that way.

Here is baiscally what I did, set the lens on 105mm and I just fallowed the dogs continually focusing.

Thanks for any replys.
Nick


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apersson850
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Sep 14, 2008 23:21 |  #2

Not seeing all the images it's difficult to say, but the usual result is not that you get 100% of the images in perfect focus. But 40% sounds low to me.


Anders

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The ­ Fox
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Sep 15, 2008 11:16 |  #3

Bump.


"I work from awkwardness. By that I mean I don't arrange things. If I stand in front of something, instead of arranging it, I arrange myself" -Diane Arbus
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Jim ­ G
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Sep 15, 2008 11:19 |  #4

Between the old AF and the 20D's not-so-up-to-date AF I think 40% is quite good, actually. I wouldn't expect higher using that that lens and my 20D shooting that sort of thing.


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The ­ Fox
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Sep 15, 2008 11:21 |  #5

No the thing I am wondering is if I put an lens with a ring usm would that change anything?
Nick


"I work from awkwardness. By that I mean I don't arrange things. If I stand in front of something, instead of arranging it, I arrange myself" -Diane Arbus
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Jim ­ G
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Sep 15, 2008 11:23 |  #6

The Fox wrote in post #6310480external link
No the thing I am wondering is if I put an lens with a ring usm would that change anything?
Nick

If the lens' AF system was a limiting factor then getting a lens with quicker AF (i.e. ring type USM and f/2.8 or wider) will probably help.


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tonylong
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Sep 15, 2008 11:26 |  #7

Both the body and the lens factor into AI Servo performance. You probably got great results from using an older lens and older body.

If you want the best results from the 20D you want to use a lens that has a fast AF, such as an 85 1.8 or a 70-200 f/2.8. Those two lenses are highly recommended for their sporting capabilities (fast AF). Use one or both of those and you will have a benchmark lens that will give your 20D the best opportunity to do its stuff.

More recent cameras have upgraded AF capabilities as well, so to get the best of this type of shooting, you would look at, say, a 40D for prosumer shooting.


Tony
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cdifoto
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Sep 15, 2008 11:28 |  #8

Your lens isn't a good lens for tracking and your body isn't tuned for it either. There's a reason for the 1 series bodies and big-ass L glass. You just smacked into it head first.


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The ­ Fox
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Sep 15, 2008 18:15 |  #9

I have used every canon DSLR but a 1D series bodies. I hear that they are the holy grail in AF.

Anyways, everyone around me had a 40D or 1D with 70-200mm F2.8L IS on but me. I just happened upon it and did not have my L glass on me because I was not expecting to shoot this. I guess that was my first mistake.
Nick


"I work from awkwardness. By that I mean I don't arrange things. If I stand in front of something, instead of arranging it, I arrange myself" -Diane Arbus
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tonylong
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Sep 18, 2008 02:49 |  #10

The Fox wrote in post #6312834external link
I have used every canon DSLR but a 1D series bodies. I hear that they are the holy grail in AF.

Anyways, everyone around me had a 40D or 1D with 70-200mm F2.8L IS on but me. I just happened upon it and did not have my L glass on me because I was not expecting to shoot this. I guess that was my first mistake.
Nick

And your question is ???

Seriously we can be a helpful bunch around here, but you have to give us some information and specifics to help you with!


Tony
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Gatorboy
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Sep 18, 2008 07:36 |  #11

Were you using the shutter button for focus or the back button (*)? The back button is the perferred method of sports photographers.

Also, with AI Servo, if you are just using one focus point (in your case center), you've got to make sure you stay on target. All focus points may be a better way to go. When you use all points, it uses the center focus point first and if you happen to drift off, the other focus points will take over in keeping your focus locked on your subject.


Dave Hoffmann

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ungwaha
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Oct 12, 2008 13:39 |  #12

Gatorboy wrote in post #6332388external link
Were you using the shutter button for focus or the back button (*)? The back button is the perferred method of sports photographers.

What is th (*) button and where is it located? I had the same problem shooting at the Indy MOTOGP race. I was using a 20D with a Sigma 70-200 f2.8.

I also hada problem were the lens would focus to like 4 ft in front of me when I was trying to shoot about 100yds off.( i had the same with a Canon 70-200 f/ 2.8 IS I rented for bikeweek)


New to me 20d with kit lens, and I already bought a another lens 70-300 usm III. Plus a Sigma 70-200 2.8 APO thingy.

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Jon
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Oct 12, 2008 14:58 |  #13

Were you using AI-Servo or AI-Focus? The latter is really single-shot AF to start with until it decides if your subject's moving, so it may well lag.


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sbbruin
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Oct 12, 2008 19:08 as a reply to Jon's post |  #14

strictly back button focuser here, always on AI servo with my 20D. with my 85 1.8, tracking subjects is no problem whatsoever, especially in daylight. its not a 100% keeper rate, but its closer to that than 40% for sure. center point only, as its by far the most accurate on the 20D.

tried tracking with the 50 1.8, and got keeper rates around 25%. i'd have to say, i think AF tracking has a little more to do with the lens being used, especially with xxD bodies. now, if you're using xxxD bodies, BOTH the body and lens may be the culprits for bad AF tracking. strictly my experience here, nothing more, nothing less...




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The ­ Fox
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Oct 12, 2008 21:35 |  #15

I found that if I put ring USM glass on it, I am getting 90%+ keeper rate now.
Nick


"I work from awkwardness. By that I mean I don't arrange things. If I stand in front of something, instead of arranging it, I arrange myself" -Diane Arbus
7D Gripped x2 | 50D Gripped | 17-50mm F2.8 | 35mm F1.4 | 50mm F1.4 | 85mm F1.8 | 70-200mm F4L IS |

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AF Servo on 20D
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