The 18 is fine . Although I still need to find the adapter/step up ring for extra protection. It's a 24/2.0 I recently acquired for less than $200. The repair is going to cost more than the lens. I might have to hold off til next year.
i see, whew, I'm also still on the lookout for an original 49-72. I have a combination of step up rings that came with the lens, its functional for the time being. The 24/2 is really nice, I go back and forth between it and the 28/2 both awesome.