This filter uses our standard B+W F-Pro filter mount, which has a front accessory thread and is made of brass.Truly Neutral Gray designManufactured from Water-White Schott Glass
Product DescriptionBecause it attenuates the light twice as much as the 501 Filter, i. e. by two aperture stops (it transmits 25% of the incoming light), this graduated filter already produces quite dramatic effects. Because of the increased difference in brightness, it is even more important for the horizon line
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