Comparison of Pentax 21mm f/3.2 AL Limited HD DA and Pentax SMC P-DA 21mm f/3.2 AL Limited

Attribute	Pentax SMC P-DA 21mm f/3.2 AL Limited ×	Pentax 21mm f/3.2 AL Limited HD DA ×
Magnification Ratio (x)	0.17	0.17
Filter Size (mm)	43	43
Focus Details	"Quick Shift" AF/MF mechanism	"Quick Shift" AF/MF mechanism
Closest Focus (m)	0.2	0.2
Lens Construction	8 elements in 5 groups, including 1 hybrid aspherical element	8 elements in 5 groups, including 1 hybrid aspherical element
Length (mm)	25	25
Focal Length (mm)	21.00	21.00
Diaphragm Blades Type	-	rounded
Brand	Pentax	Pentax
Image Circle	APS-C	APS-C
Name	Pentax SMC P-DA 21mm f/3.2 AL Limited	Pentax 21mm f/3.2 AL Limited HD DA
Weight (g)	140	134
Type	Wide Prime	Wide Prime
Notes	Dual filter attachment design: 43mm filters on the hood, and 49mm filters on the lens (without use of the hood).	Available in black or silver; Dual filter attachment design: 43mm filters on the hood, and 49mm filters on the lens (without use of the hood)
APS Equivalent	31.5mm	32mm
Aperture (f)	3.20 - 22.00	3.20 - 22.00
Diaphragm Blades	7	7
Diagonal Angle of View (degree)	68.00	68.00
Diameter (mm)	63	63