用于60 mm同轴系统
黑色材质，保证遮光性
遮挡同轴系统四周的杂散光
适合搭建紧凑型光学系统
螺纹规格SM2
提供两端内外螺纹(SM2-xxA)、内螺纹(SM2-xxB)和外螺纹(SM2-xxC)三个版本
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