Comparison of Pentax SMC P-FA 24mm f/2 and Sigma 24mm ƒ/1.8 EX DG Aspherical Macro

Attribute	Sigma 24mm ƒ/1.8 EX DG Aspherical Macro ×	Pentax SMC P-FA 24mm f/2 ×
Magnification Ratio (x)	0.37	-
Type	Wide Prime	Wide Prime
Notes	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax, Four-Thirds	-
Name	Sigma 24mm ƒ/1.8 EX DG Aspherical Macro	Pentax SMC P-FA 24mm f/2
Weight (g)	485	405
Diameter (mm)	83.6	74
Brand	Sigma	Pentax
APS Equivalent	1.5x: 36mm; 1.6x: 38.4mm	36mm
Focal Length (mm)	24.00	24.00
Closest Focus (m)	0.18	0.3
Lens Construction	10 elements in 9 groups, including 2 aspherical elements	11 elements in 9 groups
Filter Size (mm)	77	67
Aperture (f)	1.80 - 22.00	2.00 - 22.00
Diagonal Angle of View (degree)	84.10	84.00
Focus Details	Dual Focus mechanism	-
Image Circle	35mm	35mm
Diaphragm Blades	9	-
Length (mm)	82.5	66