Compare lenses

Sigma 20mm f/1.4 DG DN Art vs TTArtisan 21mm f/1.5 ASPH

The Sigma 20mm f/1.4 DG DN Art and the TTArtisan 21mm f/1.5 ASPH side by side, computed from this guide's catalogue.

Which to pick

Pick the Sigma 20mm f/1.4 DG DN Art if you want autofocus. Pick the TTArtisan 21mm f/1.5 ASPH if you want a fit on more cameras (95 against 66 in this guide).

Still torn? Ask the guide about the Sigma 20mm f/1.4 DG DN Art and the TTArtisan 21mm f/1.5 ASPH

Specs side by side

Rows that differ are in full colour; the better value is marked where one is better by any measure.
Spec	Sigma 20mm f/1.4 DG DN Art	TTArtisan 21mm f/1.5 ASPH
Maker	Sigma	TTArtisan
Focal length	20mm (prime)	21mm (prime)
Full-frame equivalent	20mm	21mm
Maximum aperture	f/1.4	f/1.5
Made for	Full frame	Full frame
Mounts	Sony E, L-Mount	Sony E, Nikon Z, Canon RF, Leica M
Stabilised	no	no
Autofocus	yesautofocus	no, manual focus
Weight	630 g	not listed
Cameras it fits	66 in this guide	95 in this guidefits more cameras

Focal range, in full-frame terms

Sigma 20mm f/1.4 DG DN Art: 20mm.

TTArtisan 21mm f/1.5 ASPH: 21mm.

Aperture

Sigma 20mm f/1.4 DG DN Art: f/1.4 wide open.

TTArtisan 21mm f/1.5 ASPH: f/1.5 wide open.

Each opening drawn to scale against f/1.4: a smaller f-number lets in more light and blurs the background more.

Field of view

How wide each sees, at each end, on the sensor it was made for.

Cameras they fit

41 cameras in this guide take both, so either works on the same body. In all, the Sigma 20mm f/1.4 DG DN Art fits 66 and the TTArtisan 21mm f/1.5 ASPH 95.