Comparison of Zeiss 35mm f/2 Loxia 2/35 and Pentax SMC P-FA 31mm f/1.8 AL Limited

Attribute	Pentax SMC P-FA 31mm f/1.8 AL Limited ×	Zeiss 35mm f/2 Loxia 2/35 ×
Closest Focus (m)	0.3	0.3
Magnification Ratio (x)	0.16	0.17
Length (mm)	68.5	59.2
Focus Details	-	Manual focus only, with large 180 degree focus throw, engraved distance and DOF scales
Diagonal Angle of View (degree)	70.00	63.00
Diaphragm Blades	-	10
Image Circle	35mm	35mm
Aperture (f)	1.80 - 22.00	2.00 - 22.00
Name	Pentax SMC P-FA 31mm f/1.8 AL Limited	Zeiss 35mm f/2 Loxia 2/35
Brand	Pentax	Carl-zeiss
Weight (g)	345	340
Type	Wide Prime	Wide Prime
Lens Construction	9 elements in 7 groups, including 1 aspherical element	9 elements in 6 groups, front element made of special glass with anomalous partial dispersion; Zeiss T* anti-reflective coating
Filter Size (mm)	58	52
Focal Length (mm)	31.00	35.00
Notes	-	Sony E-Mount (full frame); Weather-resistant lens mount gasket; Included Accessories: Lens hood, front and rear lens caps, de-click key.
APS Equivalent	46.5mm	1.5x: 52.5mm
Diaphragm Blades Type	-	rounded
Diameter (mm)	65	62.1