Hoya 52mm Neutral Density 4x (ND4) HMC Filter

Key Features

• 0.6 Optical Density
• Multicoated (HMC)
• Glass
• Filter Type    Solid ND
• Exposure Reduction    2-Stop
• Size    49 mm Rear Filter Thread 
• Front Accessory Thread / Bayonet    49 mm
• Coating    Multi-Coated
• Filter Material    Glass
• Ring Material    Aluminum 
• 4x = ND.6 (Exposure Adjustment = 2 Stops, Reduces ISO 1/4)
• Enables Slow Shutter Speeds
• Decreases Depth of Field
• Decrease Effective ISO of High Speed Film
• Controls Over-Exposure in Extreme Light Intensity
• Multi-Coated to Reduce Flare and Ghosting