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 design
Manufactured from Water-White Schott Glass
Description
Because 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 not to be positioned too far from the center of the image.
