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

Attribute	Sigma 120-300mm ƒ/2.8 DG OS HSM Sports ×	Olympus 150-400mm f/4.5 TC1.25x IS PRO ED M.Zuiko Digital ×
Aperture (f)	2.80 - 22.00	1.25 - 29.00
Diaphragm Blades Type	rounded	rounded
Filter Size (mm)	105	95
Notes	Image Stabilized (up to 4 stops); Available AF Mounts: Canon, Nikon, Sigma; Accessories: metal lens hood, lens case, tripod socket (TS-51).	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
Focus Details	Internal; Hypersonic Motor (HSM) with full-time manual override	-
Type	Telephoto Zoom	Telephoto Zoom
Diaphragm Blades	9	9
Diameter (mm)	124.4	115.8
Image Circle	35mm	Image Circle
Focal Length (mm)	120.00 - 300.00	150.00 - 400.00
Brand	Sigma	Olympus
Name	Sigma 120-300mm ƒ/2.8 DG OS HSM Sports	Olympus 150-400mm f/4.5 TC1.25x IS PRO ED M.Zuiko Digital
Weight (g)	3.062	1.875
Diagonal Angle of View (degree)	8.20 - 20.40	8.20
Lens Construction	23 elements in 18 groups	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)
Zoom System	Rotary; Internal	Rotary
Closest Focus (m)	1.5	1.3
35mm Equivalent	-	300-800mm
Length (mm)	291	314.3
APS Equivalent	1.5x: 180 - 450mm; 1.6x: 192 - 480mm	-
Magnification Ratio (x)	0.12	0.12