Comparison of Canon EF 300mm ƒ/2.8L IS II USM and Pentax SMC P-FA 300mm f/2.8 ED IF

Attribute	Pentax SMC P-FA 300mm f/2.8 ED IF ×	Canon EF 300mm ƒ/2.8L IS II USM ×
Closest Focus (m)	2	2
Magnification Ratio (x)	-	0.18
Length (mm)	340	248
Focus Details	Internal	Inner focusing; Ultra-sonic Motor (USM), AF/PF/MF switch, Focus Preset, Range Limiter
Diagonal Angle of View (degree)	8.20	8.30
Diaphragm Blades	-	9
Image Circle	35mm	35mm
Aperture (f)	2.80 - 32.00	2.80 - 32.00
Name	Pentax SMC P-FA 300mm f/2.8 ED IF	Canon EF 300mm ƒ/2.8L IS II USM
Brand	Pentax	Canon
Weight (g)	2660	2400
Type	Telephoto Prime	Telephoto Prime
Lens Construction	10 elements in 7 groups, including 1 ED element	16 elements in 12 groups, including 2 fluorite elements
Filter Size (mm)	112	52
Focal Length (mm)	300.00	300.00
Notes	Included Accessories: Case	Image Stabilization (4-stops); Included Accessories: lens hood and case
APS Equivalent	450mm	480mm
Diaphragm Blades Type	-	rounded
Diameter (mm)	135	128