Unlock Creative Control with the Adjustable ND2-ND400 Variable Density Filter Combination Frame: The innovative design of this adjustable ND filter features a combination frame, allowing the lens to rotate and achieve a variable ND value. This rotation enables you to smoothly transition from light to dark, giving you precise control over the exposure settings for your photography. Recommended Range of Use: Utilizing the principle of dual CPL superposition, this filter allows for adjustments within the ND2-ND400 range. It is ideal for a wide array of photographic conditions, though it does not support extremely high-density segments like ND1000 or ND2000. Scale Familiarization: To maximize the effectiveness of this filter, it's important to familiarize yourself with its scale range. Position the lens towards the sky or a bright area, start from the minimum setting, and gradually increase to the maximum. Pay close attention to the color changes in the viewfinder, and note the scale position where uneven dimming first appears. Long Exposure: The filter's scale includes a slow door switch position, essential for achieving long exposure shots. This setting, particularly for high-density segments, requires an exposure time of over 4 seconds to smooth out any noticeable dimming or "X" shadow effects. Moiré Fringe: Any uneven dimming observed is not a defect but rather a natural moiré fringe occurrence. Prolonged exposure times can effectively eliminate these "X" shadow effects, ensuring your images remain distraction-free. Remember, the maximum position approaches ND1000 and should be avoided for optimal results. Optical Glass and Aluminum Alloy: Constructed from shock-proof tempered optical glass and a durable aluminum alloy frame, this adjustable ND filter is designed to withstand the rigors of frequent use. Its robust construction ensures longevity and reliability, making it an indispensable tool for photographers. Elevate your photographic capabilities with the Adjustable ND2-ND400 Variable Density Filter. Designed for versatility and precision, it allows photographers to master light control and capture stunning, high-quality images with ease.