Comparison of Zeiss 21mm f/2.8 Milvus 2.8/21 and Sigma 24mm f/1.4 DG HSM Art

Attribute	Zeiss 21mm f/2.8 Milvus 2.8/21 ×	Sigma 24mm f/1.4 DG HSM Art ×
Filter Size (mm)	82	77
Notes	Available lens mounts: Canon EF (ZE), Nikon F (ZF.2); Weather-sealed construction to protect against dust and moisture; Hood and lens caps included.	Available AF Mounts: Canon EF, L-Mount, Nikon F, Sigma SA and Sony E; Compatible with Sigma's USB Dock and Mount Conversion Service
Closest Focus (m)	0.22	0.25
Magnification Ratio (x)	0.2	0.19
Type	Wide Prime	Wide Prime
Length (mm)	92.5	90.2
APS Equivalent	1.5x: 31.5mm; 1.6x: 33.6mm	1.5x: 36mm; 1.6x: 38.4mm
Diagonal Angle of View (degree)	90.00	84.10
Image Circle	35mm	35mm
Focal Length (mm)	21.00	24.00
Brand	Carl-zeiss	Sigma
Name	Zeiss 21mm f/2.8 Milvus 2.8/21	Sigma 24mm f/1.4 DG HSM Art
Weight (g)	735	665
Aperture (f)	2.80 - 22.00	1.40 - 16.00
Diaphragm Blades	9	9
Diaphragm Blades Type	rounded	rounded
Lens Construction	16 elements in 13 groups, including 4 Anomalous Partial Dispersion elements; Enhanced Zeiss T* anti-reflective coating	15 elements in 11 groups, including 3 FLD, 4 SLD and 2 aspherical elements
Diameter (mm)	95.3	85
Focus Details	Manual focus only	HSM (Hypersonic Motor) with full-time manual focus override