This Zeiss lens has auto focus to give you the best setting for each picture. It is not a zoom lens, but rather a prime lens.
From Photospecialist
Zeiss Milvus 35mm F2.0 ZE Mount Canon
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Zeiss Milvus F2.0 35mm Lens ZE Mount
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Zeiss 35mm f2 Milvus ZE Lens - Canon EF Mount