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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 15 Aug 2014 (Friday) 05:19
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HELP: 70-200 2.8 IS aperture not always responding

 
Romax12
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189 posts
Likes: 1
Joined Dec 2012
     
Aug 15, 2014 05:19 |  #1

hey guys.
so I bought my 70-200 2.8 is (version i) from a family friend about a year ago.
the lens was working perfectly fine up until yesterday:
when I took some shots at F13, I noticed that my images was blown out, like they were shot at F2.8
it seems that for some reason, the lens not always use the aperture I select on my camera.
for example, if I put my camera on F2.8, take a shot, then changing to F32, there is no differnce in the image in terms of exposure.
I looked at the inside of the lens, and when I press the DOF preview button on my t3i, the aperture ring on the lens not always move to the selected aperture, but only after a few clicks. I can shoots 10 images at F32, and only 1 will actually be at F32, the rest will be with open aperture.
I thought that my camera is faulty, but my 18-135 seems to work fine.
I turned off the camera, took the lens out and put it back in, but nothing seems to work.

I don't know if its related to the problem that I have since the month I bought the lens:
sometimes when I press the shutter button, I get the message: connection between lens and camera body is faulty. please check your connections" - something like that. then i have to turn the camera off and back on, and that usually solves the problem.

Do you guys know this problem? Im really frustruated and Im looking for help please!

UPDATE:
I put the camera in AV mode, pressed on the DOF-preview button, and turned the dial to move the aperture in real time. I did it for a minute or so, and it seems to fix the problem.
I also cleaned the lens and body contacts for extra care, I hope that this will solve the problem. I will update this post in case that something will occure.


Canon t3i
--- EF-S 18-135 f3.5-5.6 IS --- EF 70-200 f2.8 L IS usm ---
600ex-rt and yn-622c (2x)

  
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HELP: 70-200 2.8 IS aperture not always responding
FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
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