Sony FE 28mm f/2 with Ultra-Wide adapter: Resolution
Resolution
Our tests show that the Sony Ultra Wide Converter gives distinctly soft results wide open, but is much better at smaller apertures. Peak sharpness is achieved at f/5.6 through to f/11, although the edges of the frame never quite catch up with the centre. Stopping down further induces diffraction softening, especially at f/22.
Sony 21mm f/2.8 MTF resolution at f/2.8
Sony 21mm f/2.8 MTF resolution at f/4
Sony 21mm f/2.8 MTF resolution at f/5.6
Sony 21mm f/2.8 MTF resolution at f/8
Sony 21mm f/2.8 MTF resolution at f/11
Sony 21mm f/2.8 MTF resolution at f/16
Sony 21mm f/2.8 MTF resolution at f/22
