注意：
be careful:
1.更换时请注意现场环境，建议拆掉在办公室等相对环境较好的地方更换
Please pay attention to the on-site environment during replacement. It is recommended to remove it and replace it in a relatively good environment such as the office
2.安装时轻拿轻放，注意安装时的水平放置
Handle with care during installation, and pay attention to the horizontal placement during installation
3.务必清理枪体外部
Be sure to clean the exterior of the gun body
聚焦镜片的更换
聚焦凸面朝下（即安装后朝向保护镜方向）
Focusing convex face downward (i.e., facing the direction of the protective mirror after installation)
聚焦镜密封圈为：15*21*2.7
Focusing mirror sealing ring: 15 * 21 * 2.7
默认的聚焦镜规格为：（焊接）D20*4.5 F150 （四合一清洗）D20*3.5 F400
The default focus lens specification is: (welding) D20 * 4.5 F150 (three-in-one cleaning) D20 * 3.5 F400
准直镜片的更换
本机型使用的准直镜片规格为 D16 *5 F60
he lens specification used for this model is D16 * 5 F60
反射镜片的更换
原厂镜片带支架一体，方便更换，请勿自行使用胶水粘镜片
The original lens is integrated with a bracket for easy replacement. Do not use glue to glue the lens yourself