所有型号都有内置空气净化挡圈，在恶劣的饿环境中也可便捷有效的保持光学清洁。
All models have a built-in air purge collar that conveniently and efficiently maintains optical cleanliness in harsh environments.
所有型号都有内置空气净化挡圈，在恶劣的饿环境中也可便捷有效的保持光学清洁。
All models have a built-in air purge collar that conveniently and efficiently maintains optical cleanliness in harsh environments.
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