【Introducing NEEWER BASICS】 Simple and practical, NEEWER BASICS is an economical product line that focuses on essential functions and designs, without unnecessary extras and materials 【Flexible Light Reduction】 This variable ND2-400 filter reduces light by 1-9 stops. It can avoid overexposure across a variety of weather conditions and allows you to capture motion blur effects by using slow shutter speeds and wide apertures. Simply rotate the frame to exact marks for precise exposure control 【Anti Fingerprint Coatings】 Multiple anti fingerprint coatings are resistant to water, dust, fingerprints, and smudges during outdoor shooting. A cleaning cloth is included for daily maintenance. 【Knurled Ultra Slim Frame】 The slim aluminum alloy frame can prevent vignetting on wide angle lenses while CNC machined knurling ensures smooth installation and removal. It only suits lenses with a 58mm filter thread and 62mm lens caps/hoods 【Removing the X Pattern】 A dark X pattern (or X vignetting) may appear at the max ND value. This is common when the variable ND filter, with its two polarizing filters aligned at a specific angle, interacts with certain lenses and focal lengths. To fix it, reduce ND values