Comparison of Laowa 4mm f/2.8 Fisheye MFT 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 ×	Laowa 4mm f/2.8 Fisheye MFT ×
Aperture (f)	3.50 - 32.00	2.80 - 16.00
Diagonal Angle of View (degree)	100.00 - 180.00	210.00
Magnification Ratio (x)	0.39	0.11
Notes	Distance scale, Integrated lens hood; no filter ring or rear-element filter clip	Available mounts: Micro Four Thirds
Type	Fisheye Zoom	Fisheye Prime
Closest Focus (m)	0.14	0.08
Diaphragm Blades	6	7
APS Equivalent	15 - 25.5mm	-
Image Circle	APS-C	Micro Four-Thirds
Focal Length (mm)	10.00 - 17.00	4.00
Brand	Pentax	Laowa
Name	Pentax SMC P-DA Fish-Eye 10-17mm f/3.5-4.5 ED IF	Laowa 4mm f/2.8 Fisheye MFT
Weight (g)	320	135
Diameter (mm)	68	45.2
Lens Construction	10 elements in 8 groups	7 elements in 6 groups
35mm Equivalent	-	8mm
Length (mm)	71.5	25.5
Zoom System	Rotary	-
Focus Details	"Quick-Shift" Focus System for instant shift to manual focus	Internal; Manual Focus only