The Zeiss 15mm will take no filter system unless you have the hood removed by Zeiss (a service they now offer which is not as costly as you may think)
With the hood removed, the 15mm will take the LEE SW150 system and a 95mm screw thread adapter – or if you are already invested in the 100mm system, you can use the Lee Filters 100mm push-on holder straight to the hood-less lens, but only with one filter slot to get results without vignetting.
