Comparison of Canon EF 400mm ƒ/4 DO IS II USM and Pentax SMC P-FA 80-200mm f/2.8 ED IF

Attribute	Canon EF 400mm ƒ/4 DO IS II USM ×	Pentax SMC P-FA 80-200mm f/2.8 ED IF ×
Notes	Image Stabilization (4 stops); Weather-sealed construction	Included Accessories: Lens Hood
Magnification Ratio (x)	0.13	0.19
Filter Size (mm)	52	77
Focus Details	Inner focusing; full-time manual focus and ring USM	Internal
Closest Focus (m)	3.3	1.4
Diagonal Angle of View (degree)	6.20	12.50 - 30.50
Lens Construction	18 elements in 12 groups, including 1 aspheric and 1 UD element; Newly-developed gapless dual-layer diffractive optical (DO) elements	16 elements in 13 groups, including 1 ED element
Focal Length (mm)	400.00	80.00 - 200.00
APS Equivalent	640mm	120 - 300mm
Brand	Canon	Pentax
Image Circle	35mm	35mm
Name	Canon EF 400mm ƒ/4 DO IS II USM	Pentax SMC P-FA 80-200mm f/2.8 ED IF
Weight (g)	2100	1571
Type	Telephoto Prime	Telephoto Zoom
Aperture (f)	4.00 - 32.00	2.80 - 32.00
Diaphragm Blades	9	-
Diaphragm Blades Type	rounded	-
Length (mm)	233	191
Zoom System	-	Rotary
Diameter (mm)	128	86.4