A little magnetic ring could open a world of filters for your compact camera
The concept behind the CarrySpeed MagFilter is a fantastic one. For $25, you get a two-piece kit — a metal ring that is stuck to the front of your high-end compact camera, and then a filter which magnetically latches to the ring. That's it, simple, fast, and it'll allow you to use filters on your Sony RX100 or Canon S100, and easily pull them off when you don't need them. These cameras have enough of a following with expert users that you can bet some people are begging for filters to use when out shooting.