Comparison of Canon EF 20mm f/2.8 USM and Laowa 15mm f/4 1:1 Macro

Attribute	Laowa 15mm f/4 1:1 Macro ×	Canon EF 20mm f/2.8 USM ×
Filter Size (mm)	77	72
Aperture (f)	4.00 - 32.00	2.80 - 22.00
Closest Focus (m)	0.12	0.25
Magnification Ratio (x)	1	0.14
Type	Wide Macro Prime	Wide Prime
Focus Details	Internal; Manual Focus only	Inner focusing; full-time manual focus and USM
APS Equivalent	1.5x: 22.5mm; 1.6x: 24mm	32mm
Notes	Up to +/- 6mm shift is possible (APS-C sensors only); Petal-shaped lens hood included; Available mounts: Canon EF, Nikon F, Pentax K, Sony A, Sony E	-
Image Circle	35mm	35mm
Focal Length (mm)	15.00	20.00
Brand	Laowa	Canon
Name	Laowa 15mm f/4 1:1 Macro	Canon EF 20mm f/2.8 USM
Weight (g)	410	405
Diagonal Angle of View (degree)	110.00	94.00
Diaphragm Blades	14	6
Diameter (mm)	83.8	71
Length (mm)	64.7	77
Diaphragm Blades Type	rounded	-
Lens Construction	12 elements in 9 groups, including 1 ED and 3 HR elements	11 elements in 9 groups