Comparison of Zeiss 50mm f/2 Loxia 2/50 and Sigma 65mm f/2 DG DN Contemporary

Attribute	Sigma 65mm f/2 DG DN Contemporary ×	Zeiss 50mm f/2 Loxia 2/50 ×
Filter Size (mm)	62	52
Notes	Available AF Mounts: L-Mount, Sony E-Mount	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)	0.55	0.45
Magnification Ratio (x)	0.15	0.14
Type	Tele Prime	Standard Prime
Length (mm)	74.7	59.2
APS Equivalent	1.5x: 97.5mm	1.5x: 75mm
Diagonal Angle of View (degree)	36.80	46.80
Image Circle	65mm	35mm
Focal Length (mm)	65.00	50.00
Brand	Sigma	Carl-zeiss
Name	Sigma 65mm f/2 DG DN Contemporary	Zeiss 50mm f/2 Loxia 2/50
Weight (g)	405	320
Aperture (f)	2.00 - 22.00	2.00 - 22.00
Diaphragm Blades	9	10
Diaphragm Blades Type	rounded	rounded
Lens Construction	12 elements in 9 groups, with 1 SLD glass and 2 aspherical lenses	6 elements in 4 groups; Zeiss T* anti-reflective coating
Diameter (mm)	72	62.1
Focus Details	Smooth, quiet and high-speed AF via stepping motor	Manual focus only, with large 180 degree focus throw, engraved distance and DOF scales