Changes

Clean glass surfaces with the following operations as required before use.

Clean glass surfaces with the following operations as required before use.

(1) Perform all lens assembly and other work in a clean environment (class 1000 or less).

(1) Perform all lens assembly and other work in a clean environment (class 1000 or less). （If there are no conditions, try to find a clean space for assembly.）

(2) Do not touch the glass surface with hand and make any object contact with it. If dust or other is stuck to a glass surface, blow it off with an air blower. (For dust stuck through static electricity, ionized air is recommended.)

(2) Do not touch the glass surface with hand and make any object contact with it. If dust or other is stuck to a glass surface, blow it off with an air blower. (For dust stuck through static electricity, ionized air is recommended.)

使用前，请按照以下要求进行清洁玻璃表面的操作。

使用前，请按照以下要求进行清洁玻璃表面的操作。

(1)在干净的环境中(1000级或以下)执行所有镜头组装和其他工作。

(1)在干净的环境中(1000级或以下)执行所有镜头组装和其他工作。(如果没有条件，尽量找寻一个干净的空间进行装配)。

(2)切勿用手触摸玻璃表面，任何物体不得接触。如果玻璃表面粘有灰尘或其他物质，请用吹球吹掉 (对于静电滞留的灰尘，建议使用电离空气)。

(2)切勿用手触摸玻璃表面，任何物体不得接触。如果玻璃表面粘有灰尘或其他物质，请用吹球吹掉 (对于静电滞留的灰尘，建议使用电离空气)。