光学元件标识升级公告
用途：将楔形棱镜安装在SM1螺纹透镜套管或旋转安装座中或将平面光学元件以某一角度安装在SM1透镜套筒内
4种楔角可选：3° 53'，7° 41'，11° 22'，18° 9'
带卡环扳手槽，便于定位
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