A zoom lens includes, in order from the object side to the image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a third lens unit having a positive refractive power. The first lens unit and the third lens unit move in the optical axis direction during zooming. The following conditions are satisfied: 0.60

 
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> Image forming apparatus including intermediate transfer member and method of controlling the same

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