see also:

• a catalogue of Micro Four Thirds lenses
• Olympus mZD 25mm f/1.2 PRO lens
• Olympus m.ZD 25mm f/1.8 standard lens
• Olympus mZD 17mm f/1.2 Pro lens
• Panasonic Lumix 20mm f/1.7 pancake lens

• released in late 2021 as the 1st lens from the new OM Systems company
• this is a light IPX1-rated weathersealed pro lens but unlike the larger,heavier, more expensive Olympus mZD 25mm f/1.2 PRO lens, it does not have a MF clutch or a Lns Function button
• ergonomically a better fit for the E-M5 style cameras than the 25mm f/1.2

• 20mm f/1.4 giving 57-degree angle of view
• close focus 25cm but has same “macro” magnification of 0.11x (0.22x in FF terms) as the Olympus mZD 25mm f/1.2 PRO lens which focuses to 30cm
• 11 elements in 10 groups incl. three ED elements, one 'Super ED' element, two super HR (high-refractive) elements and two aspherical elements
• ZERO nano lens coating plus flourine protective coating to front element
• 9 circular aperture blades
• 58mm filter
• “feathered” bokeh
• 61.7mm (2.43“) x 63.4mm (2.5”)
• 247g
• $US799

• https://www.imaging-resource.com/lenses/om-system/20mm-f1.4-pro-m.zuiko-digital-ed/review/
  • vignetting at f/1.4 but largely gone by f/1.8
  • sharpest at f/4-5.6 but only marginally better than wide open
  • slight longitudinal chromatic aberration (LoCA)
  • no ugly onion-ring bokeh effect or dirty bokeh but there is some cat's eye towards the edges
• https://www.photographyblog.com/reviews/olympus_om_system_m_zuiko_digital_ed_20mm_f1_4_pro_review