This IFH-100 Filter Holder for 100mm Filters from Irix is a universal filter holder designed for 100mm-wide square filters. Its lightweight, compact construction allows the use of two filters without any vignetting effect. The construction of the filter holder allows for quick and easy attachment to the lens, along with free rotation around the optical axis when using graduated filters.
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The IFH-100 will not work with the Irix 95mm Circular Polarizer and Plate filters at the same time. 95mm Circular filters up to 3.5mm max. will work but not the thicker Irix CPL.
This filter holder can't be used with Irix's own 95mm CPL filter. Their IFH-100 filter holder video states that it can be used with a 3.5mm max. circular filter (lens mounted) and 1 single 100x100mm 2mm thick filter in the holder. The Irix 95mm CPL is too thick. When the IFH-100 is installed on an Irix 15mm f2.4 Blckstone lens using the supplied hood mount adapter and a Irix 95mm CPL is screwed into the lens front filter mount, a single 100x100x2mm filter won't fit without fouling. Very poor design as making the IFH-100 Square filter mount 1mm or so higher would have solved this problem. I suppose this is why the Irix IFH-100-PRO filter holder was released. Unfortunately as of 11/8/2022 B&H don't stock it and won't do a special order for one. If you want to use Square filters with a circular CPL, the IFH-100 isn't for you. The Irix IFH-100-PRO is though as it comes with an intergrated Irix CPL with external adjustment. This is the ideal filter holder for an Irix 15mm f2.4 as it still mounts on the lens hood mount with the supplied Irix adapter and accepts 2 100x100x2mm filters as well as the intergrated CPL. Hopefully B&H will stock it in the future.