Comparison of Olympus 150-400mm f/4.5 TC1.25x IS PRO ED M.Zuiko Digital and Sigma 120-300mm f/2.8 EX DG OS HSM APO

Attribute	Olympus 150-400mm f/4.5 TC1.25x IS PRO ED M.Zuiko Digital ×	Sigma 120-300mm f/2.8 EX DG OS HSM APO ×
Aperture (f)	1.25 - 29.00	2.80 - 22.00
Diaphragm Blades Type	rounded	rounded
Filter Size (mm)	95	105
Notes	Built-in image stabilization CIPA rated for 4.5 stops, Supported with 5-axis Sync IS up to 8 stops at 150mm, 6 stops at 400mm	Image Stabilized (up to 4 stops). Available AF Mounts: Sigma, Canon, Nikon. Included Accessories: Bayonet type Hood (LH1128-01), Tripod socket (TS-31
APS Equivalent	-	1.5x: 180 - 450mm; 1.6x: 192 - 480mm
Type	Telephoto Zoom	Telephoto Zoom
Diaphragm Blades	9	9
Diameter (mm)	115.8	114.4
Image Circle	Image Circle	35mm
Focal Length (mm)	150.00 - 400.00	120.00 - 300.00
Brand	Olympus	Sigma
Name	Olympus 150-400mm f/4.5 TC1.25x IS PRO ED M.Zuiko Digital	Sigma 120-300mm f/2.8 EX DG OS HSM APO
Weight (g)	1.875	-
Diagonal Angle of View (degree)	8.20	8.20 - 20.40
Lens Construction	28 elements in 18 groups (Built-in teleconverter : 7 elements in 4 groups); (1 EDA lens, 4 Super ED lenses, 2 ED lenses, 2 HR lenses, 1 HD lens)	23 elements in 18 groups, including 1 SLD and 2 FLD elements
Zoom System	Rotary	Rotary; Internal
Closest Focus (m)	1.3	1.5
35mm Equivalent	300-800mm	-
Length (mm)	314.3	289.2
Focus Details	-	Internal; HSM with full-time manual override
Magnification Ratio (x)	0.12	0.12