Use the adapter ring on my RX-100. You have a small ring on the lens of the RX-100 glue (not annoying), then you can simply turn the filter adapter paperboard and he holds magnetic. The filter adapter is light and the red ring gives the whole a nice touch. The RX-100 looks a bit beefy total. Use the filter adapter for a polarizing filter. Lens cap was also mandatory. Compactness suffers then of course something.