Hitachi VM-1600A 用户手册

AUTO FOCUS 

 

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When the "FOCUS AUTO/MAN" switch is set to "AUTO" position, ordinary objects are 
automatically in optimum focus. 

 OBJECTS HARD TO AUTO FOCUS 

 1. Objects is not in the center. 

 2. Object in far and near positions at the same time. 

 3. Object with continuous variation from far to near positions. 

 4. Object behind glass.