Comparison of Sigma 50mm ƒ/1.4 EX DG HSM and Tamron 45mm ƒ/1.8 Di VC USD SP (Model F013)

Attribute	Tamron 45mm ƒ/1.8 Di VC USD SP (Model F013) ×	Sigma 50mm ƒ/1.4 EX DG HSM ×
Filter Size (mm)	67	77
Notes	Available mounts: Canon EF, Nikon F, Sony A; VC Optical Image Stabilization (Canon and Nikon only); Included Accessories: Lens hood, lens caps.	Supported AF Mounts: Canon, Four-Thirds, Nikon, Pentax, Sigma, Sony. * If the camera body does not support HSM, autofocus will not be available.
Closest Focus (m)	0.29	0.45
Magnification Ratio (x)	0.29	0.14
Type	Standard Prime	Standard Prime
Length (mm)	91.7	84.5
APS Equivalent	1.5x: 67.5mm; 1.6x: 72mm	1.5x: 75mm; 1.6x: 80mm
Diagonal Angle of View (degree)	51.30	47.00
Image Circle	Image Circle	35mm
Focal Length (mm)	45.00	50.00
Brand	Tamron	Sigma
Name	Tamron 45mm ƒ/1.8 Di VC USD SP (Model F013)	Sigma 50mm ƒ/1.4 EX DG HSM
Weight (g)	540	505
Aperture (f)	1.80 - 16.00	1.40 - 16.00
Diaphragm Blades	9	9
Diaphragm Blades Type	circular	rounded
Lens Construction	10 elements in 8 groups, including 1 LD (Low Dispersion) and 2 aspherical elements	8 elements in six groups, 1 aspherical lens element
Diameter (mm)	80.4	68.2
Focus Details	Internal; USD (Ultrasonic Silent Drive) with continuous manual focus mechanism	HSM, with full-time manual focus override