アマゾン太郎 3 I returned mine.The build quality is decent. Apart from the thread, which is really difficult to unscrew from my Marumi 39mm filter, and I mean *really* difficult. The front thread is too deeply recessed, and I cannot mount any of my filters on the front side of the hood.I don't know if it gets stuck when mounting on my Summicron, because after getting it stuck on the filter, I didn't want to risk mounting it directly.