When the subject is at 30cm from the lens front, the depth-of-field is as below. Wide-angle: 28.1 to 32.3cm with aperture fully open, :25.4 to 37.6cm with aperture stopped down. When the subject is at 25cm from the lens front, the depth-of-field is as below. Telephoto: 24.9 to 25.1cm with aperture fully open, 24.8 to 25.2cm with aperture stopped down.