Comparison of Nikon 28mm f/2.8 AIS Nikkor and Sigma 24mm f/3.5 DG DN Contemporary

Attribute	Sigma 24mm f/3.5 DG DN Contemporary ×	Nikon 28mm f/2.8 AIS Nikkor ×
Filter Size (mm)	55	52
Notes	Available AF Mounts: L-Mount, Sony E-Mount	Classic Nikon F Mount; AIS / AI / NAI Metering Compatibility; Includes front and rear lens caps.
Closest Focus (m)	0.11	0.2
Magnification Ratio (x)	0.5	0.26
Type	Wide Prime	Wide Prime
Focus Details	Smooth, quiet and high-speed AF via stepping motor	Manual Focus Only; Close Range Correction
APS Equivalent	1.5x: 36mm	42mm
Diameter (mm)	64	63.5
Image Circle	35mm	35mm (FX)
Focal Length (mm)	24.00	28.00
Brand	Sigma	Nikon
Name	Sigma 24mm f/3.5 DG DN Contemporary	Nikon 28mm f/2.8 AIS Nikkor
Weight (g)	225	249
Aperture (f)	3.50 - 22.00	2.80 - 22.00
Diaphragm Blades	7	7
Diagonal Angle of View (degree)	84.10	74.00
Length (mm)	48.8	45.7
Diaphragm Blades Type	rounded	-
Lens Construction	10 elements in 8 groups, with 1 SLD glass and 3 aspherical lenses	8 elements in 8 groups