Canon Community

My 1.4x iii release/anti-rotation pin doesn't aways engage and I have to move the lever back and forth a few times on occasion. Not wanting my attached lens/body to fall off, I aways try to check.  I would like to send this in for service, but it loo...

Lens: Canon 500mm L iiProblem statement:I notice that if I shoot at f8 or higher fstop that the resultant picture is more and more overexposed by about one fstop for every fstop raised. I think that the aperture is not closing to narrower than about ...