Comparison of Nikon 18mm f/2.8D AF Nikkor and Pentax SMC P-DA 14mm f/2.8 ED IF

Attribute	Nikon 18mm f/2.8D AF Nikkor ×	Pentax SMC P-DA 14mm f/2.8 ED IF ×
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Filter Size (mm)	77	77
Notes	Included Accessories: Hard Case CL-47	Included Accessories: Lens Hood
Closest Focus (m)	0.25	0.17
Magnification Ratio (x)	0.11	0.19
Type	Wide Prime	Wide Prime
Focus Details	Rear Focusing	Internal with "Quick Shift" AF/MF mechanism
APS Equivalent	27mm	21mm
Diaphragm Blades	7	6
Image Circle	35mm	APS-C
Focal Length (mm)	18.00	14.00
Brand	Nikon	Pentax
Name	Nikon 18mm f/2.8D AF Nikkor	Pentax SMC P-DA 14mm f/2.8 ED IF
Weight (g)	385	420
Diagonal Angle of View (degree)	100.00	90.00
Length (mm)	58	69
Diameter (mm)	82	83.5
Lens Construction	13 elements in 10 groups, including 1 aspherical element	12 elements in 11 groups