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This adapter screws onto Series 5 thread and has a space to hold a drop in Series 5 filter, plus a slim retaining ring.
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A retaining ring is used to hold a threadless filter in place. This retaining ring is light and thin - yet strong, thread on one side. Effectively a stopper/ block for a retainer ring that is holding a threadless filter.
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Cokin Filter holder for 35mm cameras, requires Cokin adapter ring to attach, will then take Cokin A Series filters
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