My recent move to a mirrorless system using Fuji X series cameras has been a smooth and enjoyable transition. One of the items of kit I had decided to get for the new system was a square filter system. The king of the squares is, of course Lee and they have recently introduced their new mirrorless filter system, Seven5. As befits the quality of Lee, the Seven5 is an expensive piece of kit so I went looking to see if there were any cheaper alternatives. The obvious candidate was the Cokin A series, recently rebadged for mirrorless but in my experience, the quality of their filters tends to be poor and they acrylic seems to scratch very easily. I did, however with a little more research come across a small British company producing good quality square filter systems. Like Lee, Formatt HiTech have a background in cinema lighting filters and have used their knowledge to apply it to photographic filters. They have also recently created a small square filter system for mirrorless based on their 67mm filters……..