see also:

• a catalogue of Micro Four Thirds lenses
• Panasonic Leica DG Vario-Elmarit 12-60mm f2.8-4
• 3-5x standard range zoom lenses for Micro Four Thirds
• 8-10x super-zoom lenses for Micro Four Thirds
• interview with the lens designer - Google translation

• announced Sept 2016
• 1st ever f/4 pro level 8.3x travel zoom lens

• 12-100mm f/4 = 24-200mm fov in full frame terms
• 17 elements in 11 groups including one dual-sided aspherical element, five ED elements, two Super HR lenses, one HR lens and three traditional aspherical lenses
• Z Nano Coating
• weathersealed
• manual focus clutch
• 72mm filter
• close focus to 15cm at 12mm, 45cm at 100mm
• 7-bladed circular aperture diaphragm
• optical image stabiliser allows up to 6.5EV Sync IS when used with the Olympus OM-D E-M1 mark II
• 116.5mm long (4.5“)
• 561g (1.24 pounds)
• RRP $US1,299?

• lenstip's review
  • astounding resolution wide open at 12mm and good resolution at 60-100mm (although these focal lengths are sharper at f/5.6) and performance across the frame is very good - perhaps the best results for any 8x zoom lens ever made
  • overall resolution even better then the Panasonic Lumix G 12–60 mm f/3.5–5.6 ASPH. POWER O.I.S, and much better than the Olympus mZD 12-50mm lens
  • doesn’t have any problems with the longitudinal chromatic aberration no matter what focal length
  • minimal lateral CA, but medium to high at 25mm wide open
  • RAW uncorrected distortion is relatively high but corrected in jpegs to minimal:
    • uncorrected at 12mm −6.90%, decreasing to −1.99% at 18 mm becoming zero around 25mm then becoming increasingly barrel to +2.84% by 100mm
  • minimal astigmatism and coma
  • vignetting maximal on older sensors at 1.54 EV (corrected in camera to 0.88 EV) for 12mm f/4, less on newer sensors
• http://www.photozone.de/m43/1006_olympus12100f4pro
• https://blog.mingthein.com/2017/09/08/review-the-olympus-zuiko-digital-zd-12-1004-pro/