Comparison of Nikon 1 18.5mm ƒ/1.8 Nikkor and Pentax SMC P-DA 40mm f/2.8 Limited

Attribute	Pentax SMC P-DA 40mm f/2.8 Limited ×	Nikon 1 18.5mm ƒ/1.8 Nikkor ×
Notes	Distance scale	For use with Nikon 1 compact system cameras. 2.7x conversion factor. Available in black, white or silver. HB-N104 Bayonet Hood and CL-N101 Lens Soft
Aperture (f)	2.80 - 22.00	1.80 - 16.00
Closest Focus (m)	0.4	0.2
Magnification Ratio (x)	0.13	0.12
Type	Standard Prime	Standard Prime
Focus Details	"Quick Shift" AF/MF mechanism	High-speed AF drive mechanism
APS Equivalent	60mm	50mm
Diameter (mm)	63	56
Image Circle	APS-C (but we found it didn't vignette on a 35mm film body)	Nikon 1 (CX Format)
Focal Length (mm)	40.00	18.50
Brand	Pentax	Nikon
Name	Pentax SMC P-DA 40mm f/2.8 Limited	Nikon 1 18.5mm ƒ/1.8 Nikkor
Weight (g)	90	70
Diaphragm Blades Type	-	rounded
Diaphragm Blades	9	7
Diagonal Angle of View (degree)	39.00	46.70
Length (mm)	15	36
Filter Size (mm)	5	-
Lens Construction	5 elements in 4 groups	8 elements in 6 groups, including 1 aspherical element