Sigma 19mm f/2.8 DN Art

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Prime lens

A prime lens by Sigma for APS-C cameras, 19mm f/2.8. A cheap, light wide prime from 2013, common used.

What it frames like

Its full-frame-equivalent focal length on the sensor it was made for.

How wide 19mm sees on each sensor it covers.

f/2.8 wide open, to scale against f/1.4.

On APS-C (Sony E): like 28mm on full frame; f/2.8 gives about the depth of field of f/4.2 there.
On Micro Four Thirds (Micro Four Thirds): like 38mm on full frame; f/2.8 gives about the depth of field of f/5.6 there.
On the larger-sensor bodies of Sony E: it works with the camera in a APS-C crop mode, at fewer megapixels.