Comparison of Canon EF 40mm ƒ/2.8 STM and Pentax SMC P-DA 40mm f/2.8 Limited

Attribute	Canon EF 40mm ƒ/2.8 STM ×	Pentax SMC P-DA 40mm f/2.8 Limited ×
Magnification Ratio (x)	0.18	0.13
Filter Size (mm)	52	5
Focus Details	AF/MF with STM (Stepping Motor Technology)	"Quick Shift" AF/MF mechanism
Closest Focus (m)	0.3	0.4
Lens Construction	6 elements in 4 groups, including 1 aspherical element	5 elements in 4 groups
Length (mm)	22.8	15
Focal Length (mm)	40.00	40.00
Diaphragm Blades Type	circular	-
Brand	Canon	Pentax
Image Circle	35mm	APS-C (but we found it didn't vignette on a 35mm film body)
Name	Canon EF 40mm ƒ/2.8 STM	Pentax SMC P-DA 40mm f/2.8 Limited
Weight (g)	130	90
Type	Wide Prime ("Pancake")	Standard Prime
Notes	Optional lens hood: ES-52	Distance scale
APS Equivalent	64mm	60mm
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Diaphragm Blades	7	9
Diagonal Angle of View (degree)	57.00	39.00
Diameter (mm)	68.2	63