Canon rf s 55 210mm f 5 7 1 is stm vs sigma 16 300mm f 3 5 6 7?

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From Canon RF-S 55-210mm f/5-7.1 IS STM: Canon RF-S 55-210mm f/5-7.1 IS STM: A zoom lens by Canon for APS-C cameras, 55-210mm f/5-7.1. Specs - Maker: Canon - Focal length: 55-210mm (zoom) - Maximum aperture: f/5-7.1 (it gets darker as you zoom in) - Made for: APS-C sensors - Mounts: Canon RF - Stabilised: yes - Autofocus: yes What it frames like - On APS-C (Canon) (Canon RF): like 88-336mm on full frame; f/5-7.1 gives about the depth of field of f/8-11.4 there. ...

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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