Comparison of Pentax HD DA Fish-Eye 10-17mm f/3.5-4.5 ED and Tokina 10-17mm f/3.5-4.5 AT-X 107 AF DX Fisheye

Attribute	Tokina 10-17mm f/3.5-4.5 AT-X 107 AF DX Fisheye ×	Pentax HD DA Fish-Eye 10-17mm f/3.5-4.5 ED ×
Aperture (f)	4.00 - 22.00	3.50 - 32.00
Diagonal Angle of View (degree)	100.00 - 180.00	100.00 - 180.00
Magnification Ratio (x)	0.391	0.39
Notes	Built-in Lens Hood; Available AF Mounts: Canon and Nikon Digital Only	Removable lens hood, lens caps and case included
Type	Wide Zoom	Fisheye Zoom
Closest Focus (m)	0.14	0.14
Diaphragm Blades	6	6
35mm Equivalent	-	15 - 25.5mm
Image Circle	APS-C	APS-C
Focal Length (mm)	10.00 - 17.00	10.00 - 17.00
Brand	Tokina	Pentax
Name	Tokina 10-17mm f/3.5-4.5 AT-X 107 AF DX Fisheye	Pentax HD DA Fish-Eye 10-17mm f/3.5-4.5 ED
Weight (g)	350	323
Zoom System	Rotary	Rotating
Lens Construction	10 elements in 8 groups, including one SD glass element	10 elements in 8 groups; HD coatings; SP coating on front element
Diameter (mm)	70	67.5
Length (mm)	71.1	70
APS Equivalent	1.5x: 15 - 25.5mm; 1.6x: 16 - 27.2mm	-
Focus Details	Internal	"Quick-Shift" Focus System for instant shift to manual focus