Sony SEL90M28G Manual page 10

Renowned G Lens background bokeh
Beautiful background bokeh is synonymous with the G Lens name, and it can really make the
subject stand out. Individual calibration of each lens ensures optimum compensation for
spherical aberration, resulting in smooth rendering of edges without a trace of ugly "nisen
bokeh". A nine-blade circular aperture also contributes to great looking bokeh.
Image-wide clarity from macro to infinity
Macro lenses are often used over a wide range of focusing distances, so a floating focus
mechanism has been implemented for optimum suppression of close-focus aberration. The
floating system reduces the size of the lens while maintaining outstanding clarity throughout the
image area, from infinity to the closest focusing distance.