see also:

• a catalogue of Micro Four Thirds lenses

• patent only as of Feb 2015 gives various options of configurations including:
  • 5-20mm f/1.8-2.8
  • 5-20mm f/2.0-f/3.0
  • 5-24mm f/1.8-f/3.0
  • 5-24mm f/2-f/3.1
  • 5-24mm f/1.9-3.0