Haida Filters
I use and recommend the Haida M10 Filter Holder System. Haida’s drop-in filter system is very innovative and image quality is excellent. Haida also has a solid lineup of drop-in and glass filters. I switched to the Haida system from the Formatt-Hitech holders. The Haida M10 also holds 100mm square filters, so I’m able to continue using most of my existing square filters while enjoying the more modern, flexible holder system.
Formatt-Hitech
I switched to the Haida M10 holder system over Formatt-Hitech to avoid vignetting at wide angles. Watch this video to see why I switched to the Haida M10. I continue to use the Firecrest 100mm glass filters with my Haida holder system. The Formatt-Hitech brand filters are top quality and produce great photos.