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Highlights: - Horseman 67mm 2.5x Center Filter is used when working with ultra-wide-angle lenses
- Fall-off of illumination towards the corners is sometimes disturbing
- Concentrically graduated center filters have been designed to compensate for this vignetting
- The transmission is independent from the wave length of the visible spectrum
- Center filter is designed to mate with Horseman wide-angle lens units with 67mm filter threads
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