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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 29 Jun 2009 (Monday) 13:13
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Slow AF on My 5D! How about 5DII????

 
fourelements99
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Jun 29, 2009 13:13 |  #1

I bought a used 5D recently and discovered that the AF is slow comparing to XTi and 40D I used before. Specially, the images came out OOF when I tried to catch some priceless moments which need fast AF. From the bodies I used, 40D has the fastest AF, XTi is the second, unfortuately the most expensive 5D is the last. The slow AF is more obivious when I use AI servo plus center focus.

Do you guys have the same slow AF issue on 5D? How about 5DII? Does 5DII have faster AF comparing to 5D or 40D?




  
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Borderfox
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Jun 29, 2009 13:15 |  #2

fourelements99 wrote in post #8195111 (external link)
I bought a used 5D recently and discovered that the AF is slow comparing to XTi and 40D I used before. Specially, the images came out OOF when I tried to catch some priceless moments which need fast AF. From the bodies I used, 40D has the fastest AF, XTi is the second, unfortuately the most expensive 5D is the last. The slow AF is more obivious when I use AI servo plus center focus.

Do you guys have the same slow AF issue on 5D? How about 5DII? Does 5DII have faster AF comparing to 5D or 40D?

What lenses are you using as this will make some difference too


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nicksan
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Jun 29, 2009 13:15 |  #3

IIRC, the 40D has crosstype AF points on all 9 points. (?)
I felt the same way as you when I used to own a 5D Classic and 40D. However, the 5D's center point is a performer. Plus you have assist points as well.

The 5D MKII improves on the performance slightly, but nothing to write home about.




  
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fourelements99
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Jun 29, 2009 13:17 |  #4

Borderfox wrote in post #8195118 (external link)
What lenses are you using as this will make some difference too

The same lenses were used on three bodies. Most of them are L lenses, like 24-70, 70-200 is, 135 f/2.




  
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nicksan
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Jun 29, 2009 13:44 |  #5

Post an example pic. That probably will reveal what the problem is.

The 5D's center AF point should be at least on par with the 40D's center AF point. In fact, maybe better due to the assist points.

fourelements99 wrote in post #8195136 (external link)
The same lenses were used on three bodies. Most of them are L lenses, like 24-70, 70-200 is, 135 f/2.




  
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eelnoraa
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Jun 29, 2009 13:48 as a reply to  @ nicksan's post |  #6

Yes, 5D AF does feel slower than 30D/40D. I think it is actually slower. But accuracy is about the same. I can think of 2 reasons for it. 5D is older than XTi or even 30D. And 5D has shallower DOF, so AF accuracy is more important. Canon choose to slow down AF for accuracy. This one is just my wild guess.


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nicksan
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Jun 29, 2009 14:04 |  #7

5D is definitely faster than the 30D. They improved the AF on the 40D over the 30D, so that's why the 40D feels faster than the 5D.

Doesn't necessarily mean more accurate however...

eelnoraa wrote in post #8195272 (external link)
Yes, 5D AF does feel slower than 30D/40D. I think it is actually slower. But accuracy is about the same. I can think of 2 reasons for it. 5D is older than XTi or even 30D. And 5D has shallower DOF, so AF accuracy is more important. Canon choose to slow down AF for accuracy. This one is just my wild guess.




  
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swjim
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Jun 29, 2009 15:37 |  #8

I agree with nicksan, the 5D Mk II autofocus seems faster and more accurate to me than my 30D. I'm not saying the 30D is bad, the 5D just seems to be a bit better.


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Atlandis
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Jun 29, 2009 15:41 |  #9

I have no idea if my 40d is faulty, but my 5d2 got faster af... how about others..

the only slow lens I tried on my 5d2, was 50m 1.4


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JeffreyG
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Jun 29, 2009 15:52 |  #10

5D center point is better than 40D, but the outer points do indeed suck.

I had the same problem as the OP and my solution was a used 1D Mark III.


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bohdank
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Jun 29, 2009 16:44 |  #11

The center point is noticeably more reliable on the 5D than the 40D I had before.

Whether it is faster or slower. I haven't had an issue in AI Servo, yet, due to lack of speed but I haven't taxed the 5D severely yet. My gut feeling is it isn't any slower.


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Goshawk
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Jun 29, 2009 18:23 |  #12

Wow I think the boys are getting spoiled. I have never owned a 5D but would think that it has a normal focus system for it's generation. No one would or should expect it to be on par with the latest generation cameras. If it is really slow(like slower than a 10D,20D or 30D) maybe then there is a problem and you should get it checked out.


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sonnyc
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Jun 29, 2009 18:27 |  #13

I shot the 5D over the weekend for the first time and was shock of how slow the AF is. Of course, I was coming from the 1D MKII AF. But after a while, I started to get a hang of it.


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twofruitz
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Jun 29, 2009 18:44 |  #14

You just have to learn to point the AF point at things that will reflect back to get a quick focus. Normally something coloured is best. The 5dmkII can almost focus in full darkness if your pointing it at the correct thing.


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HaroldC3
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Jun 29, 2009 19:21 |  #15

eelnoraa wrote in post #8195272 (external link)
Yes, 5D AF does feel slower than 30D/40D. I think it is actually slower. But accuracy is about the same.

Coming from a 40D, I completely agree.


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