Comparison of Sony 24-70mm ƒ/4 ZA OSS Carl Zeiss Vario-Tessar T* SEL2470Z and Tamron SP AF 17-50mm f/2.8 XR Di II LD Aspherical IF

Attribute	Sony 24-70mm ƒ/4 ZA OSS Carl Zeiss Vario-Tessar T* SEL2470Z ×	Tamron SP AF 17-50mm f/2.8 XR Di II LD Aspherical IF ×
Notes	Optical SteadyShot; Included Accessories: ALC-SH130 Petal Lens Hood, Lens Case	Available AF mounts: Canon, Konica Minolta, Nikon, Pentax; Includes petal type lens hood.
Magnification Ratio (x)	0.2	0.22
Filter Size (mm)	67	67
Length (mm)	94.5	81.7
Closest Focus (m)	0.4	0.27
Diagonal Angle of View (degree)	34.00 - 84.00	31.20 - 78.80
Focus Details	Linear motor	Internal
Focal Length (mm)	24.00 - 70.00	17.00 - 50.00
APS Equivalent	36 - 105mm	1.5x: 25.5 - 75mm; 1.6x: 27.2 - 80mm
Brand	Sony	Tamron
Image Circle	35mm (Full-frame E-Mount)	Image Circle
Name	Sony 24-70mm ƒ/4 ZA OSS Carl Zeiss Vario-Tessar T* SEL2470Z	Tamron SP AF 17-50mm f/2.8 XR Di II LD Aspherical IF
Weight (g)	426	398
Type	Standard Zoom	Standard Zoom
Aperture (f)	4.00 - 22.00	2.80 - 32.00
Diaphragm Blades	7	7
Diaphragm Blades Type	rounded	-
Lens Construction	12 elements in 10 groups, including 5 aspheric and 1 extra-low dispersion element	16 elements in 13 groups, including Low Dispersion and Aspherical elements
Zoom System	Rotary	Rotary
Diameter (mm)	73	74