You asked
Is the sony e 70 350mm f 4 5 6 3 g oss worth buying used?
Here is what the site says about that.
From Sony E 70-350mm f/4.5-6.3 G OSS: Sony E 70-350mm f/4.5-6.3 G OSS: A zoom lens by Sony for APS-C cameras, 70-350mm f/4.5-6.3. Specs - Maker: Sony - Focal length: 70-350mm (zoom) - Maximum aperture: f/4.5-6.3 (it gets darker as you zoom in) - Made for: APS-C sensors - Mounts: Sony E - Stabilised: yes - Autofocus: yes What it frames like - On APS-C (Sony E): like 105-525mm on full frame; f/4.5-6.3 gives about the depth of field of f/6.8-9.4 there. - ...
From Buying used: Buying used: Cameras and lenses are built to last, and many photographers upgrade often. That makes the used market one of the best ways to afford good gear. A body that's one or two generations old is often most of the camera for a fraction of the price.
Quoted from this site's pages.