The 40mm maintains the line's hallmark T1.9 maximum aperture for consistency in performance, while the 18mm and 135mm lenses introduce a T2.2 aperture. All the Athena lenses share uniform ...

which is fantastic for an 18mm lens. It is highly unlikely that any further corrections will be needed. Bokeh is relatively smooth although not the main raison d'etre of ultra-wide lenses ...