No matter what I do the aperture doesn't change. I've shot with the lens/camera for over 3 years and this is the first time I've had a problem like this.
Sorry for not giving enough info. I first tested the lens on a t3i when I discovered the problem. I then switched to a 5Dmkii to see if it was the camera but I had the same issue. I was in video mode on the t3i and manual on the 5D. It seems like...
