Comparison of Sigma 120-300mm f/2.8 EX DG OS HSM APO and Sony 70-400mm f/4-5.6G SSM II SAL70400G2

Attribute	Sigma 120-300mm f/2.8 EX DG OS HSM APO ×	Sony 70-400mm f/4-5.6G SSM II SAL70400G2 ×
Diaphragm Blades Type	rounded	circular
Notes	Image Stabilized (up to 4 stops). Available AF Mounts: Sigma, Canon, Nikon. Included Accessories: Bayonet type Hood (LH1128-01), Tripod socket (TS-31	For Sony A-mount. 4x faster autofocus and improved optical performance compared to prior version. Included Accessories: Front and rear lens caps, ALC
Aperture (f)	2.80 - 22.00	4.00 - 32.00
Magnification Ratio (x)	0.12	0.27
Filter Size (mm)	105	77
Diameter (mm)	114.4	94.5
Type	Telephoto Zoom	Telephoto Zoom
Diaphragm Blades	9	9
Lens Construction	23 elements in 18 groups, including 1 SLD and 2 FLD elements	18 elements in 12 groups, including 2 extra-low dispersion glass elements; Nano AR Coating
Focal Length (mm)	120.00 - 300.00	70.00 - 400.00
APS Equivalent	1.5x: 180 - 450mm; 1.6x: 192 - 480mm	105 - 600mm
Image Circle	35mm	35mm
Brand	Sigma	Sony
Name	Sigma 120-300mm f/2.8 EX DG OS HSM APO	Sony 70-400mm f/4-5.6G SSM II SAL70400G2
Diagonal Angle of View (degree)	8.20 - 20.40	6.00 - 34.00
Focus Details	Internal; HSM with full-time manual override	Super Sonic wave Motor (SSM), with focus-mode/range switch and three focus-hold buttons
Zoom System	Rotary; Internal	Rotary
Length (mm)	289.2	196
Weight (g)	-	1.5
Closest Focus (m)	1.5	1.5