Comparison of Fujinon XF 16mm f/2.8 R WR and Pentax 15mm f/4 ED AL Limited HD DA

Attribute	Pentax 15mm f/4 ED AL Limited HD DA ×	Fujinon XF 16mm f/2.8 R WR ×
Filter Size (mm)	49	49
Notes	Hood is built-in, pullout type; Available in black or silver; High-grade multi-layer HD (High Definition) coating	For Fujifilm X-mount; Weather and Dust Resistant; Lens hood included.
Closest Focus (m)	0.18	0.17
Magnification Ratio (x)	0.15	0.13
Type	Wide Prime	Wide Prime
Length (mm)	39.5	45.4
APS Equivalent	23mm	24mm
Diagonal Angle of View (degree)	86.00	83.20
Image Circle	APS-C	APS-C (Fujifilm X-mount)
Focal Length (mm)	15.00	16.00
Brand	Pentax	Fujinon
Name	Pentax 15mm f/4 ED AL Limited HD DA	Fujinon XF 16mm f/2.8 R WR
Weight (g)	189	155
Aperture (f)	4.00 - 22.00	2.80 - 22.00
Diaphragm Blades	7	9
Diaphragm Blades Type	rounded	rounded
Lens Construction	8 elements in 6 groups	10 elements in 8 groups, including 2 aspherical elements
Diameter (mm)	63	60
Focus Details	Internal, with "Quick-Shift" focus system	Inner focusing system with stepper motor