I'm having a focus issue with my RX1. I added a BW clear filter, no issues. I also bought a BW polarizer. I was trying them with a Xume quick release adapter... and was putting the Polarizer on top of the Clear filter. They are stacked pretty high, the Clear, Xume, and polarizer, although no vignetting seems to occur. However, the camera would not focus. I use the AEL button. If I took the polarizer off, I would have to turn the camera on and off to focus properly. Anyone else have issues stacking two filters? PS, its not on macro.