The B+W The F-Pro 701 MRC is constructed from Schott glass for increased optical clarity. The gray transition is applied to one side of the filter using the same technology as anti-reflection coating. The gradually thinner gray layer is achieved by combining the vapours of different metal oxides in the vacuum. The glass is mounted in the F-PRO brass frame, which ensures smooth rotation of the filter. The B+W 701 MRC filters 50% of incoming light (-1 aperture number) in the darkest spot.
Gray transition filters are almost indispensable for landscape photography where they balance the large light differences of the scene. The F-Pro 701 is an ideal neutral filter to prevent overflows when photographing architecture, interior or winter landscape. This problem arises mainly with digital sensors that do not have such exposure flexibility as a film negative. MRC layers provide high light transmission (more than 99%) and prevent the light reflected from the digital sensor to return to the optical system and create a veil. The last layer protects the scratch filter and makes it easier to clean.
Specifications:
Surface Treatment: MRC (Multilayer Coating)
Thread diameter: 52mm
Permeability: 50% light (-1 aperture number)