I bought recently a Canon 18-135mm IS lens with the matching Canon EW 73B hood. To save space in my bag initially I was used to screw in the hood in reverse, so that the petals would lie along the lens. Unfortunately that required an unusual amount of force, so after a few times I gave up, and now I screw it (in the right way) on the the lens only when I have to use it. I noticed later that my lens suffers a lot from creep, and that the inner shaft (pardon me if the technical term is different) is a little loose, meaning that it can move slightly also off axis. It seems obvious to me that lens creep is a consequence of the loose inner shaft.
So, here it comes the question: do you think that I damaged my lens by applying too much torsion with the hood screwing in the wrong way?
Does the loose inner shaft compromise image quality?
If the answer is yes to either of the above, is there something I can do about it, possibly not too expensive?
Any help is highly appreciated!