The Cokin 123S Gradual Blue B2 Soft filter for Samyang SFH-14 is a gradual blue B2 filter that enhancing the blue of the sky, or sea water / waves etc. Dedicated for use with the Samyang SFH-14 filter holder with the Samyang 14mm lenses.
Further information: In total there are three Cokin filters available 154, 121M and 123S (each sold separately) which have been specially developed for the Samyang SFH-14 filter holder (sold separately). The Cokin filters are a large 161 x 139 x 3mm size. The SFH-14 is the filter holder for the Samyang 14mm lenses, enabling filters to be attached to these ultra-wide angle lenses.