The Dorr 77mm Neutral Density Filter extends the exposure time by factor 1000, which corresponds to 10 f-stops. Perfect for landscape photography and when you are shooting a fast moving subject such as traffic or moving water.

Key Features:

• Reduces the depth of field without overexposure
• Reduces light amount by 10 f-stops
• Extends the available exposure time by a factor of 1000x
• Slim filter frame to avoid vignetting
• Black coated metal to reduce reflections