I purchased this because I was surprised to find my A filter kit in a box from the long ago 35mm era (series A was what was available then for amateurs from Cokin). My filter holder was exactly like this, but, it had rust on it (from an old film developing tank) that was hard to remove completely. This is exactly the same item as the one of yore--this was made in France, as well. (I ordered the requisite 58mm ring for my Fuji S9000, as well, from here, also.)
Anyway, other users report vignetting in certain situations with digital cameras. The plastic is of a better quality than we're generally used to now. From what I've heard, I would purchase the Z-series nowadays--it's filters are wide enough better to avoid vignetting (blackening the outside edges of a photo because the filter holder or lens hood(s) partially blocks the camera's view).
I would not recommend others get started with the A-series--the filters are too small always to avoid vignetting, and, it's being discontinued by Cokin, so purchasing further filters/replacement parts in the future will be difficult.
Cokin filters are part of a filter system (from Cokin's series of differing filter sizes) that uses a specialized Cokin filter holder held to camera lenses by rings that correspond to and fit differing filter thread sizes--so, the system includes its own lens caps, lens hoods, etc.--the ones that fit on the cameras' lens threads will not work with the holder installed.
Cokin filters are high-quality specialty, and, easily interchangeable, plastic plate filters of many types (gradient, diffused, colored, star, polarized, etc.)--some very novel--that explains Cokin's enduring popularity over many decades....
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Cokin BA800A Filter Holder, A Series, 100 Pg Book.
