K&F CONCEPT 37mm Variable ND Filters ND2-32 Adjustable Fader Neutral Density ND2 - ND32 Filter, NO Spot X Black X Issue, MRC 28-Layer, Ultra Slim, Waterproof (Nano-X Series)

• Material: ND Filter: Made by Completed Professional Optical Glasses instead of Optical Resin. filter reduces the intake of light without affecting the overall color balance.
• NANOTEC: Our optical engineers developed new Nano coating layer technology， Waterproof, scratch-resistant, anti-reflective green coating, effectively prevent from oil, fingerprint, scratch, protect valued lens.
• No "X" cross on images: Say goodbye to the "X" cross on images, K&F utilize cutting edge technology you're going to say goodbye to this common issue with wide angle lenses and variable ND filters.
• Professional Design: Ultra slim rim design preventing wide angle vignetting. Extra tough aviation aluminum frame ensuring durability and jamming prevention.
• NOTE: Please verify your camera's lens thread size first(usually marked somewhere on the lens barrel or the lens cap).This number is always preceded by a "Ø" symbol. i.e. Ø37 = 37mm lens thread size.

<p><b>MRC Variable ND Filter Function</b></p> <p>✤ An ND filter allows the photographer to use a larger aperture that is at or below the diffraction limit, which varies depending on the size of the sensory medium (film or digital) and for many cameras is between f/8 and f/11</p> <p>✤ ND filters can also be used to reduce the depth of field of an image (by allowing the use of a larger aperture) where otherwise not possible due to a maximal shutter speed limit.</p> <p><b>ND filters could be used in the following conditions:</b></p> <p>1. Blurring water motion (e.g. waterfalls, rivers, oceans).</p> <p>2. Reducing depth of field in very bright light (e.g. daylight).</p> <p>3. When using a flash on a camera with a focal-plane shutter, exposure time is limited to the maximal speed (often 1/250th of a second, at best), at which the entire film or sensor is exposed to light at one instant. Without an ND filter, this can result in the need to use f/8 or higher.</p> <p>4. Reduce the visibility of moving objects.</p> <p>5. Add motion blur to subjects.</p>