Is the tamron 20 40mm f 2 8 di iii vxd good on aps c?

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From Tamron 20-40mm f/2.8 Di III VXD: Tamron 20-40mm f/2.8 Di III VXD: A zoom lens by Tamron for Full frame cameras, 20-40mm f/2.8. Specs - Maker: Tamron - Focal length: 20-40mm (zoom) - Maximum aperture: f/2.8 - Made for: Full frame sensors - Mounts: Sony E, Nikon Z - Stabilised: no - Autofocus: yes What it frames like - On full frame (Sony E, Nikon Z): as marked, 20-40mm. - On APS-C (Sony E, Nikon Z): like 30-60mm on full frame; f/2.8 ...

From Focal length converter: Aperture and depth of field: The f-number sets exposure, and that doesn't change with sensor size: f/2.8 gives the same brightness on a phone as on medium format. Depth of field does change. At the same framing, multiply the f-number by the crop factor to get the full-frame aperture with the same depth of field: f/1.8 on APS-C gives about the background blur of f/2.7 on full frame, and f/1.8 on Micro Four Thirds about ...

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