This is purely out of curiosity; I had never heard of it until a few days ago as I was leafing through a Sinar Catalog. It functions in a similar way to other modular filter holders systems (Cokin , Lee, others).
What I am curious to know is if the filters needed to be Sinar-branded filters or if any 4x4inch (100x100mm) filters by Tiffen and others also fit.
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