Lenses comparison


Manufacturer	Sigma	Sigma	Tamron	Sony
Model	17-70 mm f/2.8-4.0 DC Macro OS HSM	17-50 mm f/2.8 EX DC OS HSM	SP AF 17-50 mm f/2.8 XR Di II LD Aspherical (IF)	DT 18-55 mm f/3.5-5.6 SAM
Lenst style	Universal zoom	Universal zoom	Universal zoom	Universal zoom
Focal length	17 - 70 mm	17 - 50 mm	17 - 50 mm	18 - 55 mm
Maximum aperture	f/2.8 - 4	f/2.8	f/2.8	f/3.5 - 5.6
Angle of view	72.4 - 20.2 ^o	72.4 - 27.9 ^o	78.75 - 31.18 ^o	76 - 28.9 ^o
Closest focusing distance	0.22 m	0.28 m	0.27 m	0.25 m
Maximum magnification	1:2.7	1:5	1:4.5	1:2.9
Minimum aperture	22	22	32	22
Diaphragm blades	7	7	7	7
Auto focus type	HSM	HSM	AF	SAM
Lens Construction	17 elements / 13 group	17 elements / 13 group	16 elements / 13 group	8 elements / 7 group
Filter diameter	72 mm	77 mm	67 mm	55 mm
Macro Yes/No	Yes	No	No	No
Stabilization	Yes	Yes	No	No
Available mounts	Nikon F Sony A / Minolta Pentax K Canon EF-S	Nikon F Sony A / Minolta Sigma Pentax K Canon EF-S	Nikon F Sony A / Minolta Pentax K Canon EF-S	Sony A / Minolta
Dimensions	88.9 x 79 mm	83.5 x 91.8 mm	74 x 81.7 mm	69.5 x 69 mm
Weight	535 g	565 g	434 g	210 g
Additional information	three aspherical elements, one ELD element, Super Multi-Layer Coatings	Two FLD (“F” Low Dispersion) glass elements Two glass mold and one hybrid aspherical lens Optical Stabilizer Released: Feb. 2010		Announced: 18.05.2009
Score [max 5.00]	4.15 (24)	4.41 (27)	4.31 (27)	3.25 (4)
Our Review	Review	Review	Review