Comparison of Pentax SMC P-DA Fish-Eye 10-17mm f/3.5-4.5 ED IF and Samsung 10-17mm f/3.5-4.5 Fish-Eye Schneider D-XENON

Attribute	Pentax SMC P-DA Fish-Eye 10-17mm f/3.5-4.5 ED IF ×	Samsung 10-17mm f/3.5-4.5 Fish-Eye Schneider D-XENON ×
Aperture (f)	3.50 - 32.00	3.50 - 32.00
Magnification Ratio (x)	0.39	0.39
Notes	Distance scale, Integrated lens hood; no filter ring or rear-element filter clip	-
Focus Details	"Quick-Shift" Focus System for instant shift to manual focus	"Quick-Shift" Focus System for instant shift to manual focus once the subject is captured by AF
Closest Focus (m)	0.14	0.14
Lens Construction	10 elements in 8 groups	10 elements in 8 groups
Length (mm)	71.5	68
Focal Length (mm)	10.00 - 17.00	10.00 - 17.00
APS Equivalent	15 - 25.5mm	15 - 25.5mm
Brand	Pentax	Samsung
Image Circle	APS-C	APS-C
Name	Pentax SMC P-DA Fish-Eye 10-17mm f/3.5-4.5 ED IF	Samsung 10-17mm f/3.5-4.5 Fish-Eye Schneider D-XENON
Weight (g)	320	320
Type	Fisheye Zoom	Fisheye Zoom
Diagonal Angle of View (degree)	100.00 - 180.00	100.00 - 180.00
Diaphragm Blades	6	6
Zoom System	Rotary	Rotary
Diameter (mm)	68	71.5