Comparison of Sigma 28mm ƒ/1.8 EX DG Aspherical Macro and Tamron 35mm ƒ/1.8 Di VC USD SP (Model F012)

Attribute	Sigma 28mm ƒ/1.8 EX DG Aspherical Macro ×	Tamron 35mm ƒ/1.8 Di VC USD SP (Model F012) ×
Filter Size (mm)	77	67
Notes	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax	Available mounts: Canon EF, Nikon F, Sony A; VC Optical Image Stabilization (Canon and Nikon only); Included Accessories: Lens hood, lens caps.
Closest Focus (m)	0.2	0.2
Magnification Ratio (x)	0.34	0.4
Type	Wide Prime	Wide Prime
Focus Details	Internal with Dual Focus mechanism	Internal; USD (Ultrasonic Silent Drive) with continuous manual focus mechanism
APS Equivalent	1.5x: 42mm; 1.6x: 44.8mm	1.5x: 52.5mm; 1.6x: 56mm
Diameter (mm)	83.6	80.4
Image Circle	35mm	Image Circle
Focal Length (mm)	28.00	35.00
Brand	Sigma	Tamron
Name	Sigma 28mm ƒ/1.8 EX DG Aspherical Macro	Tamron 35mm ƒ/1.8 Di VC USD SP (Model F012)
Weight (g)	500	480
Aperture (f)	1.80 - 22.00	1.80 - 16.00
Diaphragm Blades	9	9
Diagonal Angle of View (degree)	75.40	63.40
Length (mm)	82.5	80.8
Diaphragm Blades Type	-	circular
Lens Construction	10 elements in 9 groups, including 2 aspherical elements	10 elements in 9 groups, including 1 LD (Low Dispersion), 1 XLD (eXtra Low Dispersion) and 2 aspherical elements