Comparison of Pentax HD DA Fish-Eye 10-17mm f/3.5-4.5 ED and Pentax SMC P-DA Fish-Eye 10-17mm f/3.5-4.5 ED IF

Attribute	Pentax SMC P-DA Fish-Eye 10-17mm f/3.5-4.5 ED IF ×	Pentax HD DA Fish-Eye 10-17mm f/3.5-4.5 ED ×
Aperture (f)	3.50 - 32.00	3.50 - 32.00
Diagonal Angle of View (degree)	100.00 - 180.00	100.00 - 180.00
Magnification Ratio (x)	0.39	0.39
Notes	Distance scale, Integrated lens hood; no filter ring or rear-element filter clip	Removable lens hood, lens caps and case included
Type	Fisheye 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	Pentax	Pentax
Name	Pentax SMC P-DA Fish-Eye 10-17mm f/3.5-4.5 ED IF	Pentax HD DA Fish-Eye 10-17mm f/3.5-4.5 ED
Weight (g)	320	323
Zoom System	Rotary	Rotating
Lens Construction	10 elements in 8 groups	10 elements in 8 groups; HD coatings; SP coating on front element
Diameter (mm)	68	67.5
Length (mm)	71.5	70
APS Equivalent	15 - 25.5mm	-
Focus Details	"Quick-Shift" Focus System for instant shift to manual focus	"Quick-Shift" Focus System for instant shift to manual focus