77mm Black Mist Filter 1 Special Effects Filter Ultra-Clear Multi-layer Coated With Waterproof Scratch-Resistant and Anti-Reflection Nano-Xcel Series
SKU: KF01.1668
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Normal use of Heirou products will not produce vignetting and will not be affected by other lenses under normal conditions.
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There is an outer coarse thread although I haven't tried stacking another filter.
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Hello! Yes you have. That's exactly what I did today ... screwed in an ND filter. :)
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I think both filters are good, depending on the desired effect.