No vignette at 15mm. The NX-Series Filter System is the first to allow the photographer to use a lens as wide as 15mm without any vignette.
Products featured:
Cokin NX Circular Polarising Filter
Cokin NX Frames Combo Twin-Pack 100 + 143.5
Cokin NX Frames Twin-Pack 100x100
Cokin NX Frames Twin-Pack 100x143.5