Comparison of Pentax SMC P-D FA 50mm f/2.8 Macro and Sigma Macro 50mm f/2.8 EX DG

Attribute	Sigma Macro 50mm f/2.8 EX DG ×	Pentax SMC P-D FA 50mm f/2.8 Macro ×
Name	Sigma Macro 50mm f/2.8 EX DG	Pentax SMC P-D FA 50mm f/2.8 Macro
Weight (g)	320	265
Image Circle	35mm	35mm
Brand	Sigma	Pentax
APS Equivalent	1.5x: 75mm; 1.6x: 80mm	75mm
Focal Length (mm)	50.00	50.00
Lens Construction	10 elements in 9 groups	8 elements in 7 groups
Diameter (mm)	71.4	67.5
Magnification Ratio (x)	1	1
Closest Focus (m)	0.19	0.2
Filter Size (mm)	55	49
Aperture (f)	2.80 - 45.00	2.80 - 32.00
Diagonal Angle of View (degree)	46.80	47.00
Type	Standard Prime Macro	Standard Prime Macro
Diaphragm Blades	7	8
Notes	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax; Included Accessories: Lens Hood	-
Length (mm)	66.5	60