I am having trouble with my canon 24-105 F4 lens.
It works fine with IS on and iris at F4.
As soon I am closing the iris a bit, for example F4.5 and I push the shutter my picture is shifting and the photo becomes blurry
When IS is off I am able to shoot sharp pictures at F4.5 without problems
It seems the lens is not able to let the iris and the IS work together.
So I can only work with IS at F4.0, with other iris settings I have to switch of the IS
Does anyone know about this problem?
Does anyone have the service manual of this lens?
Thanks in advance.