A zoom lens includes, in order from an object side to an image side, a first lens unit having a positive refractive power configured not to move for zooming, a second lens unit having a negative refractive power configured to move during zooming, a third lens unit having a positive refractive power configured to move during zooming, and a fourth lens unit having a positive refractive power configured not to move for zooming. The third lens unit includes a positive lens, a negative lens, and a diffractive optical element. A focal length of the third lens unit (fc), a focal length of the diffractive optical element (fdoe), a focal length at a wide angle end of the zoom lens (fW), and a focal length at a telephoto end of the zoom lens (fT) satisfy the following conditions: 0.35

 
Web www.patentalert.com

< Photographic lens system and image pickup apparatus

> Optical element holding structure, exposure apparatus, and device manufacturing method

> Information recording and reproducing apparatus, information recording medium and information recording apparatus

~ 00540