Comparison of Canon EF 400mm f/2.8L IS III USM and Sony FE 400mm f/2.8 GM OSS SEL400F28GM

Attribute	Sony FE 400mm f/2.8 GM OSS SEL400F28GM ×	Canon EF 400mm f/2.8L IS III USM ×
Filter Size (mm)	5	52
Notes	Optical SteadyShot Image Stabilization; Dust and moisture resistant	Image Stabilization (up to 5-stops of correction); Dust- and water-resistant construction; Detachable, rotatable tripod collar.
Closest Focus (m)	2.7	2.5
Magnification Ratio (x)	0.16	0.17
Type	Telephoto Prime	Telephoto Prime
Length (mm)	359	343
APS Equivalent	600mm	640mm
Diagonal Angle of View (degree)	6.20	6.20
Image Circle	35mm (Full-frame E-Mount)	35mm
Focal Length (mm)	400.00	400.00
Brand	Sony	Canon
Name	Sony FE 400mm f/2.8 GM OSS SEL400F28GM	Canon EF 400mm f/2.8L IS III USM
Weight (g)	2895	2840
Aperture (f)	2.80 - 22.00	2.80 - 32.00
Diaphragm Blades	11	9
Diaphragm Blades Type	circular	circular
Lens Construction	23 elements in 17 groups, including 1 ED and 3 Fluorite elements; Fluorine coating	17 elements in 13 groups, including 2 fluorite elements and one super UD element; Super Spectra Coating (SSC); Air Sphere Coating (ASC)
Diameter (mm)	158.1	163
Focus Details	Internal focus via dual XD (eXtreme Dynamic) Linear Motors	Inner focusing; full-time manual focus and Ring USM; Customizable Electronic Focusing Ring; 2 Focus Presets;