Comparison of Pentax SMC P-FA 28mm f/2.8 AL and Sony SAL-28F28 28mm f/2.8

Attribute	Sony SAL-28F28 28mm f/2.8 ×	Pentax SMC P-FA 28mm f/2.8 AL ×
Weight (g)	184	185
Type	Wide Prime	Wide Prime
Brand	Sony	Pentax
Name	Sony SAL-28F28 28mm f/2.8	Pentax SMC P-FA 28mm f/2.8 AL
Focal Length (mm)	28.00	28.00
Image Circle	35mm	35mm
Lens Construction	5 elements in 5 groups	5 elements in 5 groups
Diameter (mm)	71	63.5
Magnification Ratio (x)	0.13	0.11
Closest Focus (m)	0.3	0.3
Filter Size (mm)	49	49
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Diagonal Angle of View (degree)	75.00	75.00
Notes	Built-in Hood	-
APS Equivalent	42mm	42mm
Diaphragm Blades	7	-
Length (mm)	43	40.6