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The Cokin BP400A is Cokin's standard P Type filter holder, and as such, the backbone of the Cokin P Type creative filter system. The Cokin BP400A P Type Holder attaches to your P Type adapter ring, and can hold up to three P Type filters at any one time. If working with wide angle lenses, it is possible you may experience vignetting with the Cokin BP400A. Fortunately, Cokin do also make a wide angle filter holder, which only holds one filter at a time, but practically eliminates vignetting.
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