Comparison of Zeiss 35mm f/2 Loxia 2/35 and Sigma 17-50mm ƒ/2.8 EX DC OS HSM

Attribute	Sigma 17-50mm ƒ/2.8 EX DC OS HSM ×	Zeiss 35mm f/2 Loxia 2/35 ×
Aperture (f)	2.80 - 22.00	2.00 - 22.00
Filter Size (mm)	77	52
Notes	Image Stabilized (except for Pentax and Sony mounts). Available AF Mounts: Canon, Nikon, Pentax, Sigma, Sony. Included Accessories: Case, Petal-type	Sony E-Mount (full frame); Weather-resistant lens mount gasket; Included Accessories: Lens hood, front and rear lens caps, de-click key.
Closest Focus (m)	0.28	0.3
Magnification Ratio (x)	0.2	0.17
Diameter (mm)	83.5	62.1
Type	Standard Zoom	Wide Prime
APS Equivalent	1.5x: 26 - 75mm; 1.6x: 27 - 80mm	1.5x: 52.5mm
Diaphragm Blades	7	10
Image Circle	APS-C	35mm
Focal Length (mm)	17.00 - 50.00	35.00
Brand	Sigma	Carl-zeiss
Name	Sigma 17-50mm ƒ/2.8 EX DC OS HSM	Zeiss 35mm f/2 Loxia 2/35
Weight (g)	565	340
Diaphragm Blades Type	rounded	rounded
Lens Construction	17 elements in 13 groups, including 2 FLD glass elements	9 elements in 6 groups, front element made of special glass with anomalous partial dispersion; Zeiss T* anti-reflective coating
Diagonal Angle of View (degree)	27.90 - 72.40	63.00
Length (mm)	91.8	59.2
Zoom System	Rotary with lock	-
Focus Details	Internal, with Hyper-Sonic Motor; AF/MF switch	Manual focus only, with large 180 degree focus throw, engraved distance and DOF scales