Comparison of Canon EF 300mm ƒ/2.8L IS II USM and Sigma APO 300mm ƒ/2.8 EX DG HSM

Attribute	Canon EF 300mm ƒ/2.8L IS II USM ×	Sigma APO 300mm ƒ/2.8 EX DG HSM ×
Magnification Ratio (x)	0.18	0.13
Filter Size (mm)	52	46
Focus Details	Inner focusing; Ultra-sonic Motor (USM), AF/PF/MF switch, Focus Preset, Range Limiter	Internal; HSM with full-time manual override
Closest Focus (m)	2	2.5
Lens Construction	16 elements in 12 groups, including 2 fluorite elements	11 elements in 9 groups, including 2 ELD elements
Length (mm)	248	214.5
Focal Length (mm)	300.00	300.00
Diaphragm Blades Type	rounded	-
Brand	Canon	Sigma
Image Circle	35mm	35mm
Name	Canon EF 300mm ƒ/2.8L IS II USM	Sigma APO 300mm ƒ/2.8 EX DG HSM
Weight (g)	2400	2400
Type	Telephoto Prime	Telephoto Prime
Notes	Image Stabilization (4-stops); Included Accessories: lens hood and case	Available AF Mounts: [HSM version]: Sigma, Canon, Nikon; [w/o HSM]: Minolta, Pentax
APS Equivalent	480mm	1.5x: 450mm; 1.6x: 480mm
Aperture (f)	2.80 - 32.00	2.80 - 32.00
Diaphragm Blades	9	9
Diagonal Angle of View (degree)	8.30	8.20
Diameter (mm)	128	119