Best Square Filter Holder for Irix 15mm f/2.4
Finding a square filter holder for the Irix 15mm f/2.4 is notoriously tricky due to its massive 95mm front thread and ultra-wide field of view. Most standard 100mm systems cause heavy vignetting, forcing photographers toward bulky 150mm setups. After testing various rigs in the field, I’ve found that the Irix Edge IFH-100-PRO is the definitive…