Comparison of Sigma 40mm f/1.4 DG HSM Art and Tokina 50mm f/1.4 FF Opera

Attribute	Sigma 40mm f/1.4 DG HSM Art ×	Tokina 50mm f/1.4 FF Opera ×
Magnification Ratio (x)	0.15	-
Filter Size (mm)	82	72
Focus Details	HSM (Hypersonic Motor) with full-time manual focus override	Internal via ring-shaped ultrasonic motor; Full-time manual focus override
Closest Focus (m)	0.4	0.4
Lens Construction	16 elements in 12 groups, including 1 aspherical, 3 FLD and 3 SLD elements	15 elements in 9 groups, including 1 aspherical and 3 SD (Super-low Dispersion) elements; ELR (Extremely Low Reflection) Coating
Length (mm)	131	107.5
Focal Length (mm)	40.00	50.00
Diaphragm Blades Type	rounded	-
Brand	Sigma	Tokina
Image Circle	35mm	35mm
Name	Sigma 40mm f/1.4 DG HSM Art	Tokina 50mm f/1.4 FF Opera
Weight (g)	1200	950
Type	Wide Prime	Standard Prime
Notes	Available AF Mounts: Canon EF, Nikon F, Sigma SA and Sony E; Compatible with Sigma's USB Dock and Mount Conversion Service	Dust & weather resistant sealing; For Canon EF and Nikon F-mount; Bayonet type lens hood included.
APS Equivalent	1.5x: 60mm; 1.6x: 64mm	1.5x: 75mm 1.6x: 80mm
Aperture (f)	1.40 - 16.00	1.40 - 16.00
Diaphragm Blades	9	9
Diagonal Angle of View (degree)	56.80	47.40
Diameter (mm)	87.8	80