see also:

• a brief catalogue of Micro Four Thirds lenses
• Olympus mZD 300mm f/4 PRO lens
• Panasonic Leica DG 100-400mm ASPH f/4-6.3 lens

• announced Jan 2019 and slated to be available 2020
• see https://www.dpreview.com/news/6192364071/olympus-developing-150-400mm-f4-5-pro-lens-with-built-in-1-25x-teleconverter

• white pro OIS lens compatible with Dual IS
• 150-400mm f4.5 (300-800mm in full frame fov)
• with built-in 1.25x TC enabled gives 190-500mm f/5.6 (380-1000mm in full frame eq)
• compatible with MC-20 2x TC to give either:
  • 300-800mm f/9 (600-1600mm in full frame terms)
  • 375-1000mm f/11 (750-2000mm in full frame eq)