Comparison of Panasonic 15mm f/1.7 ASPH Leica DG SUMMILUX and Pentax 21mm f/3.2 AL Limited HD DA

Attribute	Pentax 21mm f/3.2 AL Limited HD DA ×	Panasonic 15mm f/1.7 ASPH Leica DG SUMMILUX ×
Diaphragm Blades Type	rounded	rounded
Notes	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)	Manual Aperture Ring; Nano Surface Coating; Available in Black or Silver; Included Accessories: Front and Rear Lens Caps, Hood, Pouch.
Aperture (f)	3.20 - 22.00	1.70 - 16.00
Magnification Ratio (x)	0.17	0.1
Filter Size (mm)	43	46
35mm Equivalent	-	30mm
Type	Wide Prime	Wide Prime
Diaphragm Blades	7	7
Lens Construction	8 elements in 5 groups, including 1 hybrid aspherical element	9 elements in 7 groups, including 3 aspherical lenses
Image Circle	APS-C	Micro Four-Thirds
Focal Length (mm)	21.00	15.00
Brand	Pentax	Panasonic
Name	Pentax 21mm f/3.2 AL Limited HD DA	Panasonic 15mm f/1.7 ASPH Leica DG SUMMILUX
Weight (g)	134	115
Diagonal Angle of View (degree)	68.00	72.00
Focus Details	"Quick Shift" AF/MF mechanism	High-speed AF; Internal with stepping motor; AF/MF switch
Diameter (mm)	63	58
Length (mm)	25	36
APS Equivalent	32mm	-
Closest Focus (m)	0.2	0.2