Comparison of Samsung 16-45mm f/4 ED AL Schneider D-XENON and Tamron SP AF 17-50mm f/2.8 XR Di II LD Aspherical IF

Attribute	Samsung 16-45mm f/4 ED AL Schneider D-XENON ×	Tamron SP AF 17-50mm f/2.8 XR Di II LD Aspherical IF ×
Aperture (f)	4.00 - 22.00	2.80 - 32.00
Diagonal Angle of View (degree)	35.00 - 83.00	31.20 - 78.80
Magnification Ratio (x)	0.26	0.22
Filter Size (mm)	67	67
Type	Standard Zoom	Standard Zoom
Closest Focus (m)	0.28	0.27
APS Equivalent	24 - 67.5mm	1.5x: 25.5 - 75mm; 1.6x: 27.2 - 80mm
Diaphragm Blades	-	7
Image Circle	APS-C	Image Circle
Focal Length (mm)	16.00 - 45.00	17.00 - 50.00
Brand	Samsung	Tamron
Name	Samsung 16-45mm f/4 ED AL Schneider D-XENON	Tamron SP AF 17-50mm f/2.8 XR Di II LD Aspherical IF
Weight (g)	365	398
Zoom System	Rotary	Rotary
Lens Construction	13 elements in 10 groups	16 elements in 13 groups, including Low Dispersion and Aspherical elements
Diameter (mm)	72	74
Length (mm)	92	81.7
Notes	-	Available AF mounts: Canon, Konica Minolta, Nikon, Pentax; Includes petal type lens hood.
Focus Details	Internal with "Quick Shift" AF/MF mechanism	Internal