Comparison of Canon EF 100-400mm f/4.5-5.6L IS II USM and Pentax 150-450mm f/4.5-5.6ED DC AW HD D FA

Attribute	Pentax 150-450mm f/4.5-5.6ED DC AW HD D FA ×	Canon EF 100-400mm f/4.5-5.6L IS II USM ×
Aperture (f)	4.50 - 27.00	4.50 - 40.00
Filter Size (mm)	86	77
Notes	High Definition (HD) coatings; Super Protect (SP) coatings to external surfaces; weather-resistant construction; removable tripod collar	Improved Image Stabilization with 3 modes and up to 4 stops correction; Dust and water resistant; Includes lens hood, tripod mount and case.
Closest Focus (m)	2	0.98
Magnification Ratio (x)	0.22	0.31
Zoom System	Rotary with lock	Rotary
Type	Telephoto Zoom	Telephoto Zoom
APS Equivalent	225 - 675mm	160 - 640mm
Diaphragm Blades	9	9
Image Circle	35mm	35mm
Focal Length (mm)	150.00 - 450.00	100.00 - 400.00
Brand	Pentax	Canon
Name	Pentax 150-450mm f/4.5-5.6ED DC AW HD D FA	Canon EF 100-400mm f/4.5-5.6L IS II USM
Weight (g)	2000	1640
Diaphragm Blades Type	rounded	rounded
Lens Construction	18 elements in 14 groups, including ED elements	21 elements in 16 groups, including 1 Flourite and 1 Super UD element; Air Sphere Coating (ASC)
Diagonal Angle of View (degree)	5.50 - 16.50	6.20 - 24.00
Length (mm)	241.5	193
Diameter (mm)	95	94
Focus Details	Internal with DC motor; Quick-Shift Focus System for changing between AF and MF by simply turning the focusing ring; Focus presets and range limiter	Inner focusing; Full-time manual focus and USM; Focus limiter switch; High-speed CPU and optimized AF algorithms