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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 30 Jun 2011 (Thursday) 09:59
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70 - 200mm F4 IS and Canon 40D

 
Lorne123
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33 posts
Joined Jun 2011
     
Jun 30, 2011 09:59 |  #1

Hi..i recently bought a 70 - 200mm F4 IS lens. I have it mounted on my Canon 40D but will be upgrading the camera soon. In the meantime I notice it has frequent trouble auto focusing on the 40D and sometime won't focus at all. Is this a camera or possibly a lens comparability issue...? Thanks for any help...


I take a lot of pictures. Once in a great while I also take a photograph.

  
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peturarna
Junior Member
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Joined Apr 2011
Location: Reykjavik, Iceland
     
Jun 30, 2011 10:02 |  #2

Have you tried to adjust the focus limiter switch on the lens?


Canon EOS 60D | Canon EF-S 15-85 | Canon EF 70-200 F4L | Canon EF 50 1.8 | Canon SpeedLite 430EX-II | Yongnuo Speedlite YN460-II

  
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Snydremark
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Location: Issaquah, WA USA
     
Jun 30, 2011 10:13 |  #3

What are you trying to focus on when you notice the difficulty?


- Eric S.: My Birds/Wildlife (external link) (7D MkII/5D IV, Canon 10-22 f/3.5-4.5, Canon 24-105L f/4 IS, Canon 70-200L f/2.8 IS MkII, Canon 100-400L f/4.5-5.6 IS I/II)
"The easiest way to improve your photos is to adjust the loose nut between the shutter release and the ground."

  
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Lorne123
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Jun 30, 2011 10:22 as a reply to  @ Snydremark's post |  #4

Hi..I did reset the limiter switch. Did not seem to help. Thanks anyway. Also I am focusing on some flowers in our garden about a 50 feet away. If I manual focus first then the AF seems to pick up and lock on after the MF is close. This seems to happen intermittently...calib​ration maybe?


I take a lot of pictures. Once in a great while I also take a photograph.

  
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Snydremark
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Location: Issaquah, WA USA
     
Jun 30, 2011 10:25 |  #5

Are you using a single AF point? or are all 9 AF points active? If all 9 are active, switch to a single AF point and see if that clears it up. When allowing the camera to pick an AF point, it doesn't always do a good job of picking the RIGHT one.


- Eric S.: My Birds/Wildlife (external link) (7D MkII/5D IV, Canon 10-22 f/3.5-4.5, Canon 24-105L f/4 IS, Canon 70-200L f/2.8 IS MkII, Canon 100-400L f/4.5-5.6 IS I/II)
"The easiest way to improve your photos is to adjust the loose nut between the shutter release and the ground."

  
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Lorne123
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Jun 30, 2011 11:17 as a reply to  @ Snydremark's post |  #6

Thanks...I have been using the single AF point. Something is just not connecting or communicating between the camera and the lens.


I take a lot of pictures. Once in a great while I also take a photograph.

  
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GregoryF
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Jun 30, 2011 11:23 |  #7

Any problems with other lenses on the 40d? If not, it sounds like a problem with the lens.


6D, 5D, 7Dii, Eos R and too many lenses, flashes and aux. gear to list!:cool:
A simple hobby gone horribily wrong

  
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Snydremark
my very own Lightrules moment
19,169 posts
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Joined Mar 2009
Location: Issaquah, WA USA
     
Jun 30, 2011 11:27 |  #8

Strange. There's certainly no inherent incompatibility with that camera and lens; have you cleaned the contacts on the lens?


- Eric S.: My Birds/Wildlife (external link) (7D MkII/5D IV, Canon 10-22 f/3.5-4.5, Canon 24-105L f/4 IS, Canon 70-200L f/2.8 IS MkII, Canon 100-400L f/4.5-5.6 IS I/II)
"The easiest way to improve your photos is to adjust the loose nut between the shutter release and the ground."

  
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gonzogolf
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Jun 30, 2011 11:32 |  #9

Trying to grab one flower at 50 feet, perhaps you might be focusing on a pretty small target for the AF to pick up. How does it perform when aimed at something a bit larger. I have this combo and found the focus to be fine.




  
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mikeporterinmd
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Location: Maryland
     
Jun 30, 2011 11:52 |  #10

If there is not enough contrast, you can have problems focusing. My 70-200 does pretty well on a T1i, but sometimes it will fail to focus on solid color objects.


Gear: Fujifilm X-S10, XF18-55 f2.8-4 R LM OIS, XF55-200mmF3.5-4.8 R LM OIS, KamLan 50mm f1.1, 28mm f.4, Pergear 7.5mm f2.8, 25mm,35mm,50mm F1.6 or so, Viltrox 56mm f1.4, Laowa 9mm f2.8, 65mm f2.8, ex-Canon user | URLS: Flickr (external link) | Blog (external link)

  
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Lorne123
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Jul 08, 2011 15:52 as a reply to  @ mikeporterinmd's post |  #11

Thanks kindly. I have sent the lens back. It is a focus problem.


I take a lot of pictures. Once in a great while I also take a photograph.

  
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70 - 200mm F4 IS and Canon 40D
FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
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