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Unlike other variable ND filters, STC's patented variable ND filter is continuous.
A good neutral density (ND) filter solves the problem of overexposure in bright conditions with large aperture lenses and slow shutter speeds by dimming the incoming light evenly across the spectrum. STC’s Variable ND Filter helps you find the right dimming coefficient for the perfect soft focus effect in a shallow depth of field or to capture moving water, or flows of traffic and people with a slow shutter speed.
Features
The filter works by rotating and overlapping two linear polarizers with diffraction grating. A large overlap can produce issues of cross patterns and color blocks, an unavoidable physical attribute of diffraction grating. But smaller angle overlapping positions, or the use of a long focal length lens, delay cross patterns’ appearance.
＊The test result used Canon 16-35mm lens and 24-70mm lens shooting on 40W / 5700K LED board. It’s just for reference on the grounds that different lens optical structures and the angle of environmental incident light would affect the appearance timing of the X pattern.
