see also:

• a brief catalogue of Micro Four Thirds lenses
• Olympus m.ZD 12mm f/2.0 lens

• a manual focus 12mm lens designed for cropped sensor cameras and comes in mounts including Micro Four Thirds system, Sony NEX E-mount camera system, and Fujifilm X mirrorless system

• 12mm f/2.0
• 67mm filter
• close focus 20cm
• 6 blades
• 12 elements in 10 groups
• 245g
• 59mm long

• ePhotozine review
  • excellent sharpness in the centre from maximum aperture - sharpest in centre at f/2.8-f/4.0
  • edge-to-edge sharpness peaks at f/5.6
  • very good build quality
  • low CA
  • good value
• Lenstip review
  • well corrected coma, almost gone by f/2.8
  • well corrected astigmatism
  • vignetting 2.21EV on APS-C
  • weak performance against bright light
  • CA a bit high
  • soft edges on APS-C
  • should be great for wide-field astrophotography
• http://petapixel.com/2014/06/04/review-rokinon-12mm-f2-0-great-option-astrophotogs-budget/
  • on APS-C, becomes the highest scoring dedicated mirrorless lens on his astrophoto lens rating system to date