Unlock Your Creative Potential with the Adjustable ND2-ND400 Variable Density Filter Combination Frame: This innovative adjustable ND filter features a combination frame design that allows for smooth rotation. By rotating the frame, you can seamlessly transition the lens from light to dark, effectively adjusting the ND value to suit your shooting needs. Recommended Range of Use: Utilizing the principle of two CPLs stacked together, this filter provides a recommended adjustable range of ND2-ND400. It is perfect for a wide variety of photography scenarios, although extremely high-density segments like ND1000 and ND2000 are not supported. Scale Familiarization: Familiarizing yourself with the scale range is crucial for optimal use. Position the lens towards the sky or a bright environment and adjust from minimum to maximum while observing the changes in the viewfinder. Note the scale position where uneven dimming begins to appear for future reference. Long Exposure: Achieve stunning long exposure shots by utilizing the slow door switch position on the scale. This technique, especially for higher density segments, often requires an exposure time of more than 4 seconds to smooth out any uneven dimming or "X" shadow effects. Moiré Fringe: Any uneven dimming is not a quality defect but rather a moiré fringe effect. With sufficient long exposure time, the "X" shadow and light inconsistencies can be effectively minimized, ensuring your images are free from distractions. Remember, the maximum position is a limit, and approaching ND1000 should be avoided. Optical Glass and Aluminum Alloy: Constructed from shock-proof tempered optical glass and an aluminum alloy frame, this adjustable ND filter offers exceptional durability and longevity. Its robust design ensures it is almost unbreakable, making it a reliable companion for all your photography adventures. Enhance your photography with the Adjustable ND2-ND400 Variable Density Filter. Designed for versatility and precision, this filter is an essential tool for photographers looking to control light and capture stunning images with ease.