Sigma 15mm f 1 4 dc contemporary vs viltrox af 15mm f 1 7 air?

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From Sigma 15mm f/1.4 DC Contemporary: Sigma 15mm f/1.4 DC Contemporary: A prime lens by Sigma for APS-C cameras, 15mm f/1.4. A fast wide prime for APS-C, about 22.5mm equivalent. Specs - Maker: Sigma - Focal length: 15mm (prime) - Maximum aperture: f/1.4 - Made for: APS-C sensors - Mounts: Sony E, Fujifilm X, Canon RF - Stabilised: no - Autofocus: yes What it frames like - On APS-C (Sony E, Fujifilm X): like 22mm on full frame; f/1.4 gives about ...

From Viltrox AF 15mm f/1.7 Air: Viltrox AF 15mm f/1.7 Air: A prime lens by Viltrox for APS-C cameras, 15mm f/1.7. Specs - Maker: Viltrox - Focal length: 15mm (prime) - Maximum aperture: f/1.7 - Made for: APS-C sensors - Mounts: Sony E, Fujifilm X, Nikon Z - Stabilised: no - Autofocus: yes What it frames like - On APS-C (Sony E, Fujifilm X, Nikon Z): like 22mm on full frame; f/1.7 gives about the depth of field of f/2.5 there. ...

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