Image pickup system and lens apparatus

A lens apparatus being used for an image pickup system including an image pickup apparatus performing image pickup through the lens apparatus, the lens apparatus comprising:

• a focus lens;
• and
• a ranging part configured to detect an object distance in each of plural ranging areas included in an image pickup region,
• wherein the image pickup system comprising:
• an operating part configured to be operated to instruct a movement of the focus lens;
• a controlling part configured to perform focus position control to move the focus lens to a position corresponding to an operation amount of the operating part;
• a determining part configured to determine a distance range where the object distances detected in the plural ranging areas are distributed;
• and
• a changing part configured to change a relationship between the operation amount of the operating part and the position of the focus lens in the focus position control according to a determination result by the determining part.