I have small problem with my camera involving the ring that is attached to the lens (this should be clear in attached picture). The ring has become loose and is able to slide along the lens freely. I was wondering if anyone had any thoughts on what I should do about it. I was thinking of sticky-taping the ring onto where it should be and leaving it at that (I'm not too concerned about it looking bad) but I'm wondering if I need to get it repaired professionally. Also, does anyone know what it does? obviously, it shows how much it is zoomed, but I don't find this function necessary because the zoom is electronically shown on screen so does it do anything else? Thanks for any help.