【Variable ND Filter】 Neutral Density Filter (ND2-ND400) reduce the light from 1 to 9 f-stops. 【Japan Optical Glass & CNC Non-Slip】 Made by completed professional Japan optical glasses instead of resin. Filter reduces the intake of light without affecting the overall color balance. CNC non-slip design ensure very easy to install and remove the filter. 【Nano Coating Layer】 Newest Nano-coating layer technology, waterproof, scratch-resistant, anti-reflective green coating, effectively prevent from oil, fingerprint, scratch, protect valued lens. 【Professional Design】 Ultra slim rim is designed for preventing wide angle vignetting. Extra tough aviation aluminum frame ensure durability and jamming prevention. Super slim original design is to avoid vignetting when you are taking photo. 【Tips】 This ND filter is compatible with all 77mm. Please verify your camera's lens thread size (usually marked somewhere on the lens barrel or printed underneath the lens cap) before ordering. The number is always preceded by a "ø" (diameter) symbol.

Slim Adjustable ND Filter Feature: 

1: Reduces the amount of light reaching the film without affecting the color. 

2: Applies slow shutter speed under strong sunlight exposure. 

3: Glass mounted with high pressure press technology. 

4: Made of high quality optical glass. 

5: Wider outer optic to help reduce vignetting at wide angles. 

6: Extinction paint seiko manufacturing,To achieve the testing sights on military standard. 

ND Filter Use Effect: 

1: Neutral density can be adjusted from ND2 to ND400, Reduces the amount of light reaching the film without affecting the color. 

2: Have Control of Any Lighting Environment. 

3: Allows wider apertures, effectively decreasing depth of field. 

4: Suitable for dynamic screen, waterfalls, streams, waves, etc. 

Note:

When using the ND filter to the maximum(ND400) or bigger degree density, it will appear "X" spot or a blur in the picture,this is a normal phenomenon. 

(Suggestion:lower down the density value gradually and reduce the aperture, until the facula disappeared.)