Comparison of Canon EF 16-35mm f/2.8L III USM and Pentax 11-18mm f/2.8 ED DC AW HD DA*

Attribute	Canon EF 16-35mm f/2.8L III USM ×	Pentax 11-18mm f/2.8 ED DC AW HD DA* ×
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Filter Size (mm)	82	82
Notes	Image stabilization; dust and moisture resistant	Dustproof, weather-resistant construction; Features latest lens coatings.
Closest Focus (m)	0.28	0.3
Magnification Ratio (x)	0.22	0.1
Zoom System	Rotary	Rotary
Type	Wide Zoom	Wide Zoom
APS Equivalent	26 - 56mm	17 - 27.5mm
Diaphragm Blades	9	9
Image Circle	35mm	APS-C
Focal Length (mm)	16.00 - 35.00	11.00 - 18.00
Brand	Canon	Pentax
Name	Canon EF 16-35mm f/2.8L III USM	Pentax 11-18mm f/2.8 ED DC AW HD DA*
Weight (g)	790	704
Diaphragm Blades Type	rounded	rounded
Lens Construction	16 elements in 11 groups, including 2 large-diameter double-surface GMo (glass-molded) elements, a ground aspherical element, and 2 UD elements	16 elements in 11 groups
Diagonal Angle of View (degree)	63.00 - 108.20	76.00 - 104.00
Length (mm)	127.5	100
Diameter (mm)	88.5	90
Focus Details	Inner focusing; AF with USM, full-time manual focus	AF with DC motor; Focus Clamp Mechanism; AF/MF switch