Comparison of Canon EF 300mm f/4L IS USM and Sigma APO 100-300mm ƒ/4 EX DG HSM

Attribute	Sigma APO 100-300mm ƒ/4 EX DG HSM ×	Canon EF 300mm f/4L IS USM ×
Filter Size (mm)	82	77
Notes	Available AF Mounts: [HSM version]: Sigma, Canon, Nikon; [w/o HSM]: Pentax, Sony	Image Stabilization
Closest Focus (m)	1.8	1.5
Magnification Ratio (x)	0.2	0.24
Type	Telephoto Zoom	Telephoto Prime
Focus Details	Internal; HSM with full-time manual override	Inner focusing; full-time manual focus and USM
APS Equivalent	1.5x: 150 - 450mm; 1.6x: 160 - 480mm	480mm
Diameter (mm)	92.4	90
Image Circle	35mm	35mm
Focal Length (mm)	100.00 - 300.00	300.00
Brand	Sigma	Canon
Name	Sigma APO 100-300mm ƒ/4 EX DG HSM	Canon EF 300mm f/4L IS USM
Weight (g)	1440	1190
Aperture (f)	4.00 - 32.00	4.00 - 32.00
Diaphragm Blades	9	8
Diagonal Angle of View (degree)	8.20 - 24.40	8.30
Length (mm)	226.5	221
Zoom System	Rotary; Internal	-
Lens Construction	16 elements in 14 groups, including 4 SLD elements	15 elements in 11 groups, including 2 UD elements