Canon lens problem

Hi all.

Just today i have noticed that my camera (canon 550d) and lens(canon 100mm 2.8) are not working properly.

I was taking pictures of something at f19 with a ring flash as i do normally but things were coming out massively overexposed.

I then experimened with no flash and it seems like at large apertures (f2.8ish) the pictures are exposing correctly, but then as i make the apertures smaller, the pictures are coming very overexposed.

I thought this was a fault with my camera at first, so tried a different lens, which worked perfectly, so i think it must be the lens that is at fault.

I have googled various things, and i think it may be a 'sticky aperture'?

I would be so grateful for any advice or how or where this can be fixed.

(i took the following pics to try and illustrate the problem)

https://flic.kr/p/muHf​7w

https://flic.kr/p/muFg​FP

https://flic.kr/p/muFS​nF

https://flic.kr/p/muH8​xj

did you clean the contacts on the lens?

yup tried that.

Also i'm quite often getting a
"Err 01 Communications between the camera and lens is faulty" screen

use the depth-of-field button, without the flash at an aperture of f8. You should see the blades of the lens, or see the image through the VF dimmed. Are you using live view?

Sounds like maybe the aperture blades aren't closing in the lens when the photos are taken.

Now i cant seem to take even a picture without the Err 01 screen

When it was working, i would set it to 2.8 and then hold down the DOF button and cycle to smaller apertures and when looking through the viewfinder it didn't darken as expected..


Strangely now when looking through the viewfinder, everything is super dark! and i cant get it to change.

Try your lens on a different body. And, you should not really be uing f/19 = diffraction error.

Tried lens on gf's body. Same problem
When i look through viewfinder or liveview, its very dark. can't change it at all

https://www.dropbox.co​m …av6/IMAG0696_BU​RST002.jpg

picture of how things look atm

Sounds like your aperture flex cable is going bad. I had the same thing happen to a Sigma 12-24. The flex cable had gotten damaged. The only thing that you could do is to replace the cable.

Perhaps you can tell us ore about your attempts to do macro of your gf body?

gasrocks wrote in post #16790898
Perhaps you can tell us ore about your attempts to do macro of your gf body?

Well, lets just say, i'm glad she doesn't need to use a macro lens when viewing my body.

Can anyone advise me on how to contact canon for a fix, or any companies that specialise in fixing lenses?

http://www.usa.canon.c​om …yCode=onlineRep​airLanding