I am in the market for a lens collar for my 70-200 F/4L IS lens (attached to a 50D). Have read lots of reviews on the different aftermarket lens collars (Canon is way too expensive) and the main complaint is that the collar is made of plastic. Many plastics are very strong and would work as well as metal.
My question is: Has anyone had an experience where the plastic collar has broken? Is the plastic material issue something to be concerned about?
What seems to be the best one out there?