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Heliopan Variable ND filter
The Heliopan variable ND filters is continuously variable from 0.3 to 1.8 denstity (1 to 6 stops). It is hard stopped at each end of its density range, has a numerically calibrated index scale as well as an index pointer to easily repeat set-ups. It is mounted in a very thin mount to eliminate vignetting on most wide angle lenses, has no color artifacts - even with very wide lenses. It is available in 52, 55, 58, 62, 67, 72, 77 and 82mm screw-in sizes. All feature a black brass anodized rotating mount.
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