BPW-400A Wide-Angle Filter Holder
The Cokin BPW-400A P Series Wide-Angle Filter Holder is from the Cokin P Series Filter system range, it is designed to help the user eliminate vignetting down to 20mm focal length, thanks to the ultra-slim design. Moreover, it also enables the use of filters when using super wide lenses. Please note: Adapter ring not included - you will need to purchase a Cokin adapter ring to fit your lens(es) unless you already own one.
How the Cokin System works
The Cokin Creative Filter System consists of three main components: A filter holder / Adapter ring and a Filter.
- Screw the adapter ring onto your lens.
- Slide the filter holder on the adapter ring until it snaps in place. The filter holder is now solidly attached to the lens, yet it can rotate both left and right.
- Slide the filter into one of the filter holder slots. The one closest to the filter holder housing is the narrowest; it allows the use of round filters with notched edges (polarizer, star filters..). The two central slots are intended for square filters. The outer slot can be used either for an additional filter or for a coupling ring.