Comparison of Sigma 17-70mm ƒ/2.8-4 DC Macro OS HSM Contemporary and Sigma 17-70mm f/2.8-4.5 DC Macro

Attribute	Sigma 17-70mm ƒ/2.8-4 DC Macro OS HSM Contemporary ×	Sigma 17-70mm f/2.8-4.5 DC Macro ×
Notes	Image Stabilized (up to 4 stops); Available AF Mounts: Canon, Nikon, Sigma, Pentax, Sony; Accessory: lens hood LH780-03.	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax
Magnification Ratio (x)	0.34	0.43
Filter Size (mm)	72	72
Length (mm)	82	82.5
Closest Focus (m)	0.22	0.2
Diagonal Angle of View (degree)	22.90 - 79.70	20.20 - 72.40
Focus Details	Internal, with Hyper-Sonic Motor; AF/MF switch	Internal
Focal Length (mm)	17.00 - 70.00	17.00 - 70.00
APS Equivalent	1.5x: 25.5 - 105mm; 1.6x: 27.2 - 112mm	1.5x: 25.5 - 105mm; 1.6x: 27.2 - 112mm
Brand	Sigma	Sigma
Image Circle	APS-C	APS-C
Name	Sigma 17-70mm ƒ/2.8-4 DC Macro OS HSM Contemporary	Sigma 17-70mm f/2.8-4.5 DC Macro
Weight (g)	470	455
Type	Standard Zoom	Standard Zoom
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Diaphragm Blades	7	7
Diaphragm Blades Type	rounded	-
Lens Construction	16 elements in 14 groups, including FLD, SLD, and 3 aspherical elements	15 elements in 12 groups, including 1 SLD and 2 aspherical elements
Zoom System	Rotary with lock	Rotary with lock
Diameter (mm)	79	79