Comparison of Fujinon XF 16mm f/2.8 R WR and Pentax 21mm f/3.2 AL Limited HD DA

Attribute	Fujinon XF 16mm f/2.8 R WR ×	Pentax 21mm f/3.2 AL Limited HD DA ×
Filter Size (mm)	49	43
Notes	For Fujifilm X-mount; Weather and Dust Resistant; Lens hood included.	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)
Closest Focus (m)	0.17	0.2
Magnification Ratio (x)	0.13	0.17
Type	Wide Prime	Wide Prime
Length (mm)	45.4	25
APS Equivalent	24mm	32mm
Diagonal Angle of View (degree)	83.20	68.00
Image Circle	APS-C (Fujifilm X-mount)	APS-C
Focal Length (mm)	16.00	21.00
Brand	Fujinon	Pentax
Name	Fujinon XF 16mm f/2.8 R WR	Pentax 21mm f/3.2 AL Limited HD DA
Weight (g)	155	134
Aperture (f)	2.80 - 22.00	3.20 - 22.00
Diaphragm Blades	9	7
Diaphragm Blades Type	rounded	rounded
Lens Construction	10 elements in 8 groups, including 2 aspherical elements	8 elements in 5 groups, including 1 hybrid aspherical element
Diameter (mm)	60	63
Focus Details	Inner focusing system with stepper motor	"Quick Shift" AF/MF mechanism