Image pickup system having ranging function

An image pickup system including a lens apparatus and a camera that captures images through the lens apparatus in a state where the image pickup system and a moving object are in movement with respect to a still object, the image pickup system comprising:

• a ranging part configured to measure object distances in plural ranging areas provided in an image pickup region of the image pickup system;
• a first setting part configured to set a first ranging area including the moving object among the plural ranging areas;
• a second setting part configured to set a second ranging area including the still object among the plural ranging areas;
• and
• a calculating part configured to calculate a moving speed of the moving object based on the object distances measured in the first and second ranging areas by the ranging part at a first time point and the object distances measured in the first and second ranging areas by the ranging part at a second time point different from the first time point.