Comparison of Nikon 300mm f/2.8D ED-IF II AF-S Nikkor and Pentax SMC P-FA 300mm f/2.8 ED IF

Attribute	Pentax SMC P-FA 300mm f/2.8 ED IF ×	Nikon 300mm f/2.8D ED-IF II AF-S Nikkor ×
Notes	Included Accessories: Case	Included Accessories: CL-L1 Case, HK-26 Hood, LN-1 Strap, 52mm filter holder, Gel Filter Holder
Magnification Ratio (x)	-	0.16
Filter Size (mm)	112	52
Focus Details	Internal	Internal with Silent Wave motor; M/A switch
Closest Focus (m)	2	2.3
Lens Construction	10 elements in 7 groups, including 1 ED element	11 elements in 8 groups, including 3 ED elements
Length (mm)	340	269
Focal Length (mm)	300.00	300.00
APS Equivalent	450mm	450mm
Brand	Pentax	Nikon
Image Circle	35mm	35mm
Name	Pentax SMC P-FA 300mm f/2.8 ED IF	Nikon 300mm f/2.8D ED-IF II AF-S Nikkor
Weight (g)	2660	2590
Type	Telephoto Prime	Telephoto Prime
Aperture (f)	2.80 - 32.00	2.80 - 22.00
Diaphragm Blades	-	9
Diagonal Angle of View (degree)	8.20	8.20
Diameter (mm)	135	122