Sony fe 70 300mm f 4 5 5 6 g oss vs tamron 28 300mm f 4 7 1?

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From Sony FE 70-300mm f/4.5-5.6 G OSS: Sony FE 70-300mm f/4.5-5.6 G OSS: A zoom lens by Sony for Full frame cameras, 70-300mm f/4.5-5.6. Specs - Maker: Sony - Focal length: 70-300mm (zoom) - Maximum aperture: f/4.5-5.6 (it gets darker as you zoom in) - Made for: Full frame sensors - Mounts: Sony E - Stabilised: yes - Autofocus: yes What it frames like - On full frame (Sony E): as marked, 70-300mm. - On APS-C (Sony E): like 105-450mm on full frame; ...

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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