Samyang af 18mm f 2 8 fe vs zeiss touit 12mm f 2 8?

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From Samyang AF 18mm f/2.8 FE: Samyang AF 18mm f/2.8 FE: A prime lens by Samyang for Full frame cameras, 18mm f/2.8. Specs - Maker: Samyang - Focal length: 18mm (prime) - Maximum aperture: f/2.8 - Made for: Full frame sensors - Mounts: Sony E - Stabilised: no - Autofocus: yes What it frames like - On full frame (Sony E): as marked, 18mm. - On APS-C (Sony E): like 27mm on full frame; f/2.8 gives about the depth of field ...

From Zeiss Touit 12mm f/2.8: Zeiss Touit 12mm f/2.8: A prime lens by Zeiss for APS-C cameras, 12mm f/2.8. Specs - Maker: Zeiss - Focal length: 12mm (prime) - Maximum aperture: f/2.8 - Made for: APS-C sensors - Mounts: Sony E, Fujifilm X - Stabilised: no - Autofocus: yes What it frames like - On APS-C (Sony E, Fujifilm X): like 18mm on full frame; f/2.8 gives about the depth of field of f/4.2 there. - On the larger-sensor ...

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