Comparison of Pentax SMC P-FA 300mm f/2.8 ED IF and Sigma 150mm ƒ/2.8 EX DG OS HSM APO Macro

Attribute	Pentax SMC P-FA 300mm f/2.8 ED IF ×	Sigma 150mm ƒ/2.8 EX DG OS HSM APO Macro ×
Aperture (f)	2.80 - 32.00	2.80 - 22.00
Diagonal Angle of View (degree)	8.20	16.40
Filter Size (mm)	112	72
Notes	Included Accessories: Case	Image Stabilized (up to 4 stops). Available AF Mounts: Sigma, Canon, Nikon, Pentax, Sony/Minolta. Included Accessories: Case, Bayonet type Hood (LH78
Type	Telephoto Prime	Telephoto Prime (Macro)
Closest Focus (m)	2	0.38
APS Equivalent	450mm	1.5x: 225mm; 1.6x: 240mm
Magnification Ratio (x)	-	1
Image Circle	35mm	35mm
Focal Length (mm)	300.00	150.00
Brand	Pentax	Sigma
Name	Pentax SMC P-FA 300mm f/2.8 ED IF	Sigma 150mm ƒ/2.8 EX DG OS HSM APO Macro
Weight (g)	2660	1180
Diameter (mm)	135	79.6
Lens Construction	10 elements in 7 groups, including 1 ED element	19 elements in 13 groups, including 3 SLD elements
Diaphragm Blades	-	9
Length (mm)	340	150
Diaphragm Blades Type	-	rounded
Focus Details	Internal	Internal; HSM with full-time manual focus override