The FE 28mm f/2, the smallest of Sony’s latest round of FE lenses, is well worth considering, as Andy Westlake finds out
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
- Filter diameter: 49mm
- Lens elements : 9
- Groups: 8
- Diaphragm blades : 9
- Aperture: f/2-22
- Minimum focus: 29cm
- Length: 60mm
- Diameter: 64mm
- Weight: 200g
- Mount: Sony E