Comparison of Pentax SMC P-FA 300mm f/2.8 ED IF and Sony 300mm f/2.8 G SSM II SAL300F28G2

Attribute	Pentax SMC P-FA 300mm f/2.8 ED IF ×	Sony 300mm f/2.8 G SSM II SAL300F28G2 ×
Aperture (f)	2.80 - 32.00	2.80 - 32.00
Diagonal Angle of View (degree)	8.20	8.20
Filter Size (mm)	112	42
Notes	Included Accessories: Case	Thanks to a new LSI drive circuit, the SAL-300F28GII offers faster, more accurate autofocusing with four times faster object tracking performance tha
Type	Telephoto Prime	Telephoto Prime
Closest Focus (m)	2	2
APS Equivalent	450mm	450mm
Magnification Ratio (x)	-	0.18
Image Circle	35mm	35mm
Focal Length (mm)	300.00	300.00
Brand	Pentax	Sony
Name	Pentax SMC P-FA 300mm f/2.8 ED IF	Sony 300mm f/2.8 G SSM II SAL300F28G2
Weight (g)	2660	2340
Diameter (mm)	135	122
Lens Construction	10 elements in 7 groups, including 1 ED element	13 elements in 12 groups, including 3 ED elements
Diaphragm Blades	-	9
Length (mm)	340	242.5
Diaphragm Blades Type	-	rounded
Focus Details	Internal	Internal; SSM (Super Sonic wave Motor) with Direct Manual Focus (2 modes), Focus Hold button, Focus Range selector, Prefocus function