Test Results: Shading and Distortion
Shading
With shading compensation turned off, the 28mm gives extremely marked vignetting, at more than 2 stops in the corners at f/2 on full frame. Stopping down to f/4 reduces this to about 0.8 stops, beyond which there’s no further improvement. Turning on vignetting compensation essentially eliminates any visible shading effect.
Sony FE 28mm f/2 shading at f/2
Sony FE 28mm f/2 shading at f/2.8
Sony FE 28mm f/2 shading at f/4
Distortion
Like other CSC lenses the 28mm uses software distortion correction as an integral component of its optical design. This means that JPEG images exhibit essentially no distortion, but uncorrected raw files will show strong barrel distortion. However this is easily corrected during raw conversion, preferably using a specific profile for the lens.
Sony FE 28mm f/2 distortion, JPEG (corrected)
Sony FE 28mm f/2 distortion, raw (uncorrected)
