Comparison of Sigma 10-20mm ƒ/3.5 EX DC HSM and Sigma 10-20mm f/4-5.6 EX DC HSM

Attribute	Sigma 10-20mm ƒ/3.5 EX DC HSM ×	Sigma 10-20mm f/4-5.6 EX DC HSM ×
Filter Size (mm)	82	77
Notes	Available AF mounts: Sigma, Canon, Nikon, Sony, Pentax; Included Accessories: Soft Case, Petal-type Hood	Available AF mounts: Sigma, Canon, Nikon, Four-Thirds, Pentax, Sony
Closest Focus (m)	0.24	0.24
Magnification Ratio (x)	0.15	0.15
Type	Wide Zoom	Wide Zoom
Length (mm)	88.2	81
APS Equivalent	1.5x: 15 - 30mm; 1.6x: 16 - 32mm	1.5x: 15 - 30mm; 1.6x: 16 - 32mm; 2.0x: 20 - 40mm
Zoom System	Rotary	Rotary
Image Circle	Image Circle	Image Circle
Focal Length (mm)	10.00 - 20.00	10.00 - 20.00
Brand	Sigma	Sigma
Name	Sigma 10-20mm ƒ/3.5 EX DC HSM	Sigma 10-20mm f/4-5.6 EX DC HSM
Weight (g)	520	470
Aperture (f)	3.50 - 22.00	4.00 - 22.00
Diaphragm Blades	7	6
Diagonal Angle of View (degree)	63.80 - 102.40	63.80 - 102.40
Lens Construction	13 elements in 10 groups, including 4 aspherical, 1 SLD and 2 ELD elements	14 elements in 10 groups, including three aspherical elements and three Special Low Dispersion (SLD) lenses
Diameter (mm)	87.3	83.5
Focus Details	Internal with HSM	Internal with HSM