Canon ef 24 70mm f 2 8l usm vs canon ef s 17 55mm f 2 8 is usm?

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From Canon EF-S 17-55mm f/2.8 IS USM: Canon EF-S 17-55mm f/2.8 IS USM: A zoom lens by Canon for APS-C cameras, 17-55mm f/2.8. The constant f/2.8 standard zoom for Canon's APS-C DSLRs. Specs - Maker: Canon - Focal length: 17-55mm (zoom) - Maximum aperture: f/2.8 - Made for: APS-C sensors - Mounts: Canon EF - Stabilised: yes - Autofocus: yes What it frames like - On APS-C (Canon) (Canon EF): like 27-88mm on full frame; f/2.8 gives about the depth of field of ...

From Canon EF 24-70mm f/2.8L USM: Canon EF 24-70mm f/2.8L USM: A zoom lens by Canon for Full frame cameras, 24-70mm f/2.8. Specs - Maker: Canon - Focal length: 24-70mm (zoom) - Maximum aperture: f/2.8 - Made for: Full frame sensors - Mounts: Canon EF - Stabilised: no - Autofocus: yes What it frames like - On full frame (Canon EF): as marked, 24-70mm. - On APS-C (Canon) (Canon EF): like 38-112mm on full frame; f/2.8 gives about the depth of ...

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