K&F Concept Import Optical Glass HD/Waterproof/Scratch Resistant Variable ND2-ND400 (1-9 Stops) ND Lens Filter with Putter for Camera Lens K&F Concept Variable ND2-ND400 Filter is a must-have for landscape photography! The K&F Concept Variable ND filter operates on the same principle as a Circular Polarizer rotate until you reach your desired effect and shoot. It allows you to have continuous control over the amount of light coming through your lens in an approximate range of 1 (ND 0.3) to 9 (ND 2.7) stops while maintaining the integrity of your image. 1. Provides 1 to 9 stops of light reduction control. 2. Ultra Slim 7.4mm. 3. Ultra-slim frame support no vignetting at 16mm focal length. 4. Comes in K&F Concept professional packaging with PU leather Case. 5. Made with Japanese imported optical glass using K&F Concept Nanotec technology. 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.) K&F Concept Variable ND2-ND400 ND Lens Filter The K&F Concept Variable ND filter is a unique, versatile, and flexible tool, affording you the convenience of using several different stop Neutral Density filters all in one. Primarily used as a photographic tool for controlling depth of field and exposure, the Variable ND is being sought in the video market for its HD/Waterproof/Scratch Resistant and the exclusive putter design, providing a professional tool for photographers and amateurs. Putter Adjustment Design The putter can provide a extra buckle to adjust the filter, especially on video shooting via the putter conveniently to reach the exact stop you need. Hydrophobic & Scratch Resistant With waterproof and scratch resistance on both glass sides, even the water spilled on glass can be easily wiped, easily for cleaning and carrying, also with anti-fog function. 28 Multi-layer Coated Each glass on both sides was coated, a total of 28 layers of coating, reducing the filter itself reflection effectively and the glare because of long time exposure. CNC Non-slip Design The CNC non-slip design can help you install and take off the filter easily. Oxidation sandblasting Filter frame has been oxidation sandblasting effectively avoiding stray light entering in the lens, and reducing the non-metallic surface reflection. Leather Carry Case This ND filter case is made of PU leather, side pull design can take out the filter conveniently.