NX Filter Frames are required when using the NX Series Holder. The lightweight, aluminum frames are essential to the Holder’s slim design and allow maximum ultra-wide-angle lens compatibility. NX Frames protect the edges of the filter and allow you to handle filters without touching the glass. 

The 100mm x 150mm frame allows photographers that own filters outside the Cokin system to use their filters with the NX system. Filters must measure 100mm x 150mm x 2mm thick to fit this frame.