Magnetischer Slim-Objektivadapter

I think, at the time, this is one of the better options out there for magnetic caps. However, I've ordered a dozen or so of these, and the manufacturing quality is a little hit or miss. This last batch had an adapter that had shallower threads, so it screwed on and slipped, meaning my front end cap wobbles around and leaks light, which means I still have to keep my old lens cap handy to set black balance on my camera. If you don't mind a wobbly semi-cheap cap, they do work really well most of the time.