Comparison of Canon EF 17-40mm f/4L USM and Sony FE 16-35mm f/4 ZA OSS Zeiss Vario-Tessar T* SEL1635Z

Attribute	Canon EF 17-40mm f/4L USM ×	Sony FE 16-35mm f/4 ZA OSS Zeiss Vario-Tessar T* SEL1635Z ×
Aperture (f)	4.00 - 22.00	4.00 - 22.00
Filter Size (mm)	77	72
Notes	Dust and moisture resistant	Sony E-mount; Image Stabilized; Dust and moisture resistant; Included Accessories: Lens hood, carrying case
Closest Focus (m)	0.28	0.28
Magnification Ratio (x)	0.24	0.19
Diameter (mm)	83.5	78
Type	Wide Zoom	Wide Zoom
APS Equivalent	27 - 64mm	24 - 52.5mm
Diaphragm Blades	7	7
Image Circle	35mm	35mm (Full-frame E-Mount)
Focal Length (mm)	17.00 - 40.00	16.00 - 35.00
Brand	Canon	Sony
Name	Canon EF 17-40mm f/4L USM	Sony FE 16-35mm f/4 ZA OSS Zeiss Vario-Tessar T* SEL1635Z
Weight (g)	500	518
Diagonal Angle of View (degree)	57.50 - 104.00	63.00 - 107.00
Lens Construction	12 elements in 9 groups, including 3 aspherical elements and 1 S-UD element	12 elements in 10 groups, including 3 ED and 5 aspherical elements
Zoom System	Rotary	Rotary
Length (mm)	96.8	98.5
Diaphragm Blades Type	-	circular
Focus Details	Inner focusing; full-time manual focus and USM;	Internal; SSM (Super Sonic wave Motor) with Focus Hold button and Auto Clutch