Product Description : 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
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