Comparison of Pentax SMC P-FA 300mm f/2.8 ED IF and Sony SAL-300F28G 300mm f/2.8 G

Attribute	Pentax SMC P-FA 300mm f/2.8 ED IF ×	Sony SAL-300F28G 300mm f/2.8 G ×
Diameter (mm)	135	122
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	Included Accessories: SH0012 Lens Hood
Type	Telephoto Prime	Telephoto Prime
Closest Focus (m)	2	2
APS Equivalent	450mm	450mm
Lens Construction	10 elements in 7 groups, including 1 ED element	13 elements in 12 groups, including 3 ED elements
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 SAL-300F28G 300mm f/2.8 G
Weight (g)	2660	2310
Diaphragm Blades	-	9
Length (mm)	340	242.5
Magnification Ratio (x)	-	0.18
Focus Details	Internal	Internal; SSM (Super Sonic wave Motor) with Direct Manual Focus, Focus Hold button, Focus Range selector, Prefocus function