Comparison of Canon EF 8-15mm ƒ/4L USM Fisheye and Pentax HD DA Fish-Eye 10-17mm f/3.5-4.5 ED

Attribute	Canon EF 8-15mm ƒ/4L USM Fisheye ×	Pentax HD DA Fish-Eye 10-17mm f/3.5-4.5 ED ×
Notes	Included Accessories: lens hood, case	Removable lens hood, lens caps and case included
Aperture (f)	4.00 - 22.00	3.50 - 32.00
Closest Focus (m)	0.16	0.14
Magnification Ratio (x)	0.39	0.39
Type	Wide Zoom Fisheye	Fisheye Zoom
Focus Details	Inner focusing; Ultra-sonic Motor (USM) with AF/MF switch	"Quick-Shift" Focus System for instant shift to manual focus
APS Equivalent	13 - 24mm	-
Diameter (mm)	78.5	67.5
Image Circle	35mm	APS-C
Focal Length (mm)	8.00 - 15.00	10.00 - 17.00
Brand	Canon	Pentax
Name	Canon EF 8-15mm ƒ/4L USM Fisheye	Pentax HD DA Fish-Eye 10-17mm f/3.5-4.5 ED
Weight (g)	540	323
Diagonal Angle of View (degree)	175.50 - 180.00	100.00 - 180.00
Diaphragm Blades	7	6
Zoom System	Rotary	Rotating
Length (mm)	83	70
35mm Equivalent	-	15 - 25.5mm
Lens Construction	14 elements in 11 groups, including UD and aspherical elements	10 elements in 8 groups; HD coatings; SP coating on front element