Lens Construction 20 elements in 14 groups

Angle of View (for SD1) 16.4° - 4.1°

Number of Diaphragm Blades 9 (rounded diaphragm)

Minimum Aperture F22

Minimum Focusing Distance 280cm / 110.2in

Maximum Magnification 1：4.9

Filter Size Diameter 95mm

Dimensions 105mm x 260.1mm / 4.1in. x 10.2in. Weight 1,930g/100.9oz. (1,830gwith protective cover PT-11)

Corresponding AF Mounts:

Sigma

Canon

Nikon