B000A6EXB6 Nikon C-PL3L Slip-in 52mm Circular Polarizing Filter

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Converts the bayonet mount of reverse-mounted lenses to the 52mm thread used forfilters and hoods
Simply turn the rotating ring on the holder to find the most effective position.
Increases contrast equally well with black & white film.
Designed for use with telephoto lenses that provide a slip-in filter holder, these filters reduce glare from non-metallic surfaces such as glass and water.
These filters do not affect autofocus or auto exposure operation..