77mm Black Mist Filter 1/8 Special Effects Filter Ultra-Clear Multi-layer Coated With Waterproof Scratch-Resistant and Anti-Reflection Nano-Xcel Series

SKU: KF01.1492

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There is an outer coarse thread although I haven't tried stacking another filter. 
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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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Hi, we checked the Sony a6600 18-135mm lens seems 55mm, if you like this filter, please reconfirm the lens size, the 55mm lens need to order 55mm size filter,thanks. 
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Hi, please refer to this video https://www.youtube.com/watch?v=GpPPwc9H0q0 which briefly showcases the difference between the three series.