Specifically designed for iPhone, and other phones with similar camera groupings IP-A holder features rapid mounting clip design, allowing for filters to be attached with bayonet style mount Stack up to 3 circular NiSi IP-A filters, with other filters sold separately Includes two filters: True Color 1-5 stop variable neutral density, and 1/4 stop Black Mist Also includes carrying case, which holds up to four filters The NiSi IP-A Filmmaker Kit for iPhone brings filmmaking to your iPhone! It features the IP-A iPhone filter holder, Black Mist 1/4, True Color ND-VARIO Pro Nano 1-5stops Variable ND and pouch. The NiSi IP-A Filter Holder for iPhone is compatible with NiSi IP-A circular filters and NiSi P2 square filter holder (sold separately). Stack up to 3 circular NiSi IP-A filters to the filter holder, or two filters with no vignetting using 0.5X camera mode. To install NiSi IP-A, circular filters align the circular filter bayonet to three installation positions. Ensure that the outer bayonet of the filter aligns with the IP-A holder slot and turn clockwise to tighten. If multiple filters need to be installed, align the three bayonets on the second round filter with the three holes on the filter clip slot fixed on the IP-A holder. Ensure that the outer bayonets of the filter are completely aligned with the round filter clip slot, then turn clockwise to tighten.