cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 

Exposure not working for EF 24-70mm F/2.8L II USM Lens

itsarvindsaxena
Apprentice

I have Canon EF 24-70mm F/2.8L II USM Lens that I have been using for past few years. For the past 2 days, the exposure on the lens is not working correctly. The pictures are very dark in live view mode as well as actual photo. Even when I bump up the ISO to 3200 and shutter speed to 1/10 in an outdoor area, the lighting is barely visible.

 

I've tried my camera with other lenses and they work fine. So, I know for sure that it's something to do with the lens. Any ideas or suggestions would be greatly appreciated. Thanks!

8 REPLIES 8

kvbarkley
VIP

Sounds like the aperture is stuck.


@kvbarkley wrote:

Sounds like the aperture is stuck.


Welcome to the forum.

 

Yes. Is the optical viewfinder dark when you look into it? If you look into the lens from the front do you see the aperture blades? Set Av to f/22 and press the DOF button while looking into the lens - is anything moving?

John Hoffman
Conway, NH

1D X Mark III, Many lenses, Pixma PRO-100, Pixma TR8620a, LR Classic

Thank you John. The optical view finder is also dark when I look through it. Not as much as the lens but still darker than the lighting conditions in the room. I also tried setting the aperture to F/22 and present the DOF button but I don't see anything moving in the lens.

 

I did notice that the exposure compensation for the len is stuck at -2 and doesn't change even when I change the exposure setting to +2 in the camera.

Greetings,

After testing with other lenses, this has "contact canon" all over it.  The lens might require service.  

~Rick
Bay Area - CA


~R5 C (1.0.2.1) ~RF Trinity, ~RF 100~400, +Canon Control Ring

~6D2 (v1.1.1) Retiring ~EF Trinity, others ~DxO PhotoLab Elite ~Windows10/11 Pro ~EVGA RTX 3080Ti FTW3 Ultra ~ImageClass MF644Cdw ~Pixel6 ~CarePaks Are Worth It

ebiggs1
Legend
've tried my camera with other lenses and they work fine

It is unlikely it is a camera problem. But there are other things besides aperture blade fault. Flex cable for example. At any rate it’s a Canon issue
EB
EOS 1DX and 1D Mk IV and several lenses!

wq9nsc
Authority

As others noted, the aperture blades aren't responding so it is something Canon service will almost surely have to address.  The one "trick" that might work is set the aperture to its highest number and tap the depth of field preview button (usually to the right side of the lens mount on most Canon bodies) several times.  This is telling the aperture stepper to cycle between it wide open and fully closed settings and SOMETIMES this will unstick a stuck aperture mechanism.  I don't have much faith in it working because this is generally only sucessful with a lens that has been sitting unused for a long period of time which doesn't sound like the case with your 24-70.

 

Rodger

EOS 1DX M3, 1DX M2, 1DX, 5DS R, M6 Mark II, 1D M2, EOS 650 (film), many lenses, XF400 video

Thanks for the trick Rodger but as you mentioned, it didn't work. I think my only solution would be send it out for repair.

deepen
Apprentice

This kind of situation I also face. But after reaching here I have no more doubt on this topic. So thank you very much, John. The thing is that the optical viewfinder is also dark when I look through it. Not as much as the lens but still darker than the lighting conditions inside the room. I also tried omegle setting the aperture to F/22 and present the DOF button but I do not see anything moving in the lens. I did notice that the exposure compensation for the lens is stuck at -2 chatiw and doesn't change even when I change the exposure setting to +2 in the camera. But overall thanks for this awesome guidance.

Announcements
11/22/2022: New firmware available for EOS R3, EOS R7 and EOS R10
11/16/2022: We're thrilled to be ranked among the Best Employers for Veterans in 2022 by Forbes.
10/14/2022: Help ensure your autofocus is properly aligned with a Canon Precision Alignment
09/19/2022: New firmware version 1.0.4.1 is available for EOS C70
08/31/2022: New firmware version 1.1.1 is available for RF 70-200mm L IS USM
08/09/2022: New firmware version 1.2.0 is available for CR-N 300
08/09/2022: New firmware version 1.2.0 is available for CR-N 500
07/28/2022: New firmware version 1.2.1 is available for EOS-R3
07/21/2022: New firmware version 1.6.0 is available for EOS-R5
07/21/2022: New firmware version 1.6.0 is available for EOS-R6
07/21/2022: New firmware version 1.1.0 is available for EOS-R7
07/21/2022: New firmware version 1.1.0 is available for EOS-R10
07/14/2022: New firmware version 1.0.1 is available for CR-X300
07/01/2022: New firmware version 1.3.0 is available for PowerShot PICK
06/10/2022: Service Notice:UPDATE: Canon Inkjet Printer continuous reboot loop or powering down
06/07/2022: New firmware version 1.3.2 is available for PowerShot G7 X Mark III
06/07/2022: New firmware version 1.0.3 is available for EOS M50 Mark II
05/31/2022: Did someone SAY Badges?
05/26/2022: New firmware version 1.0.5.1 is available for EOS-C500 Mark II
05/26/2022: New firmware version 1.0.3.1 is available for EOS-C300 Mark III
05/10/2022: Keep your Canon gear in optimal condition with a Canon Maintenance Service
05/05/2022: We are excited to announce that we have refreshed the ranking scale within the community!
04/26/2022: New firmware version 1.0.1.1 is available for EOS R5 C
03/23/2022: New firmware version 1.0.3.1 is available for EOS-C70
02/09/2022: Share Your Photos is back!
02/07/2022: New firmware version 1.6.1 is available for EOS-1DX Mark III
01/19/2022: READY FOR ANYTHING EOS-R5 C
01/13/2022: Community Update. We will be retiring the legacy profile avatars on 01/20/2022. Click this link to read more.
01/05/2022: Welcome to CES 2022!