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Thread started 19 Jun 2014 (Thursday) 16:28
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5D3 focus issue with 100-400 (outer points)

 
Frosticles
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Jun 19, 2014 16:28 |  #1

Not sure really where to start. Previously owned a 7d & coupled together with the 100-400 was fantastic & never missed focus in a1 servo on all 19 points. Have now changed to a 5D3 & am having problems with it focusing in A1 servo on the very outer focus points. It seems to drag & hunt whereas the 7d locked straight away.
Hoping it is something simple. All help greatly appreciated.

Kind regards, Kevin.


Kind regards, Kevin
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apersson850
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Jun 20, 2014 05:27 |  #2

Try first to use the cross type points only, to see if that improves things.


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Frosticles
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Jun 20, 2014 09:05 |  #3

apersson850 wrote in post #16983019 (external link)
Try first to use the cross type points only, to see if that improves things.

Hi there, Yes, have tried these. The outer ones are cross type. Problem is persisting :(


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Paulstw
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Jun 20, 2014 09:37 |  #4

The 5D3 AF system is more complex than my ex wife.

http://cpn.canon-europe.com …_AF_setting_gui​debook.pdf (external link)

That's the user guide for the AF system and it'll tell you what AF points are active with what lenses and widest apertures.

Apparently 21 cross type AF points can be used with that lens and other f/5.6 lenses.




  
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rrblint
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Jun 20, 2014 10:25 as a reply to  @ Paulstw's post |  #5

For the lens that you are using, only the central 21 points are cross type:


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Frosticles
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Jun 20, 2014 11:01 |  #6

rrblint wrote in post #16983513 (external link)
For the lens that you are using, only the central 21 points are cross type:

thumbnail
Hosted photo: posted by rrblint in
./showthread.php?p=169​83513&i=i162025891
forum: Canon EOS Digital Cameras

Thank you for that. Greatly appreciated. What I can't understand though is that it was perfect on the 7D but hunts on the 5D3. Were all the 19 points on the 7D Cross type with this lens?


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rrblint
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Jun 20, 2014 12:23 |  #7

Frosticles wrote in post #16983591 (external link)
Thank you for that. Greatly appreciated. What I can't understand though is that it was perfect on the 7D but hunts on the 5D3. Were all the 19 points on the 7D Cross type with this lens?

According to the 7D manual no, provided that the lens is racked out far enough so that the maximum aperture becomes f5.6. I suspect though that it's not a hard cut-off when the lens hits f5.6 and that the cross-type points may continue to work for some focal lengths even after the lens reaches f5.6(just guessing here though).


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Frosticles
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Jun 20, 2014 14:13 as a reply to  @ rrblint's post |  #8

It's only the outer ones that are hunting. All the others seem to be fine


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5D3 focus issue with 100-400 (outer points)
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