Comparison of Sigma 18-50mm ƒ/2.8 EX DC Macro and Sigma 18-50mm ƒ/2.8-4.5 DC OS HSM

Attribute	Sigma 18-50mm ƒ/2.8 EX DC Macro ×	Sigma 18-50mm ƒ/2.8-4.5 DC OS HSM ×
Filter Size (mm)	72	67
Notes	Available AF Mounts: Sigma, Canon, Nikon, Sony, Pentax, Four-Thirds	Available AF Mounts: Sigma, Canon, Nikon, Sony, Pentax. Included Accessories: Case, Lens Hood. Optical Stabilization.
Closest Focus (m)	0.2	0.3
Magnification Ratio (x)	0.33	0.24
Type	Standard Zoom	Standard Zoom
Length (mm)	85.8	88.6
APS Equivalent	1.5x: 27 - 75mm; 1.6x: 28.8 - 80mm	1.5x: 27 - 75mm; 1.6x: 28.8 - 80mm
Zoom System	Rotary, non-telescoping	Rotary
Image Circle	Image Circle	Image Circle
Focal Length (mm)	18.00 - 50.00	18.00 - 50.00
Brand	Sigma	Sigma
Name	Sigma 18-50mm ƒ/2.8 EX DC Macro	Sigma 18-50mm ƒ/2.8-4.5 DC OS HSM
Weight (g)	450	395
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Diaphragm Blades	7	7
Diagonal Angle of View (degree)	27.90 - 69.30	27.90 - 69.30
Lens Construction	15 elements in 13 groups, including aspherical and Special Low Dispersion (SLD) elementss	16 elements in 12 groups, including 2 SLD and 3 aspherical lenses
Diameter (mm)	79	74
Focus Details	Internal focusing system	Internal with HSM