Comparison of Pentax SMC P-FA 20mm f/2.8 and Sony SAL-20F28 20mm f/2.8

Attribute	Sony SAL-20F28 20mm f/2.8 ×	Pentax SMC P-FA 20mm f/2.8 ×
Focus Details	Rear focusing	-
Weight (g)	285	255
Type	Wide Prime	Wide Prime
Brand	Sony	Pentax
Name	Sony SAL-20F28 20mm f/2.8	Pentax SMC P-FA 20mm f/2.8
Diameter (mm)	78	70
Image Circle	35mm	35mm
Lens Construction	10 elements in 9 groups	10 elements in 9 groups
APS Equivalent	30mm	30mm
Magnification Ratio (x)	0.13	0.12
Closest Focus (m)	0.25	0.24
Filter Size (mm)	72	67
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Diagonal Angle of View (degree)	94.00	94.00
Diaphragm Blades	7	-
Focal Length (mm)	20.00	20.00
Notes	Included Accessories: SH0013 Lens Hood	-
Length (mm)	53.5	44