Sony SEL1635Z Vario-Tessar T FE 16-35mm F4 ZA OSS Interchangeable Full Frame E-mount Lens - International Version (No Warranty) This version is originally intended for sale outside the US and may contain adapters, manuals, and warranties not compatible with US standards. Model: SEL1635Z Mount: E-mount Focus Length (mm): 16-35 35mm equivalent focal-length (APS-C): 24-53.2mm