Comparison of Canon EF-M 22mm ƒ/2 STM and Pentax 21mm f/3.2 AL Limited HD DA

Attribute	Pentax 21mm f/3.2 AL Limited HD DA ×	Canon EF-M 22mm ƒ/2 STM ×
Filter Size (mm)	43	43
Notes	Available in black or silver; Dual filter attachment design: 43mm filters on the hood, and 49mm filters on the lens (without use of the hood)	EF-M lens mount exclusively for EOS M bodies.
Closest Focus (m)	0.2	0.15
Magnification Ratio (x)	0.17	0.21
Type	Wide Prime	Wide Prime
Length (mm)	25	23.7
APS Equivalent	32mm	35mm
Diagonal Angle of View (degree)	68.00	63.50
Image Circle	APS-C	APS-C
Focal Length (mm)	21.00	22.00
Brand	Pentax	Canon
Name	Pentax 21mm f/3.2 AL Limited HD DA	Canon EF-M 22mm ƒ/2 STM
Weight (g)	134	105
Aperture (f)	3.20 - 22.00	2.00 - 22.00
Diaphragm Blades	7	7
Diaphragm Blades Type	rounded	rounded
Lens Construction	8 elements in 5 groups, including 1 hybrid aspherical element	7 elements in 6 groups, including 1 aspheric element
Diameter (mm)	63	60.9
Focus Details	"Quick Shift" AF/MF mechanism	Internal, using Stepper Motor (STM); Fly-by-wire manual focus.