see also:

• Olympus Four Thirds dSLR system
• Four Thirds lenses
• Micro Four Thirds system
• 25mm "standard" lenses for Micro Four Thirds
• Sony A7II full frame with Canon EF 50mm f/1.8ii vs Olympus OM-D with PanaLeica D 25mm f/1.4 lens – real world comparison images

Here is the lens mounted on a Panasonic GH-1 Micro Four Thirds camera via an adapter and with an Olympus WCON-08B PRO 0.8x wide converter on the front of it which makes the whole lens look much bigger but effectively makes it a 20mm focal length lens just for fun:

• a premium quality wide aperture “standard” lens for Four Thirds designed to Leica standards which sold in Australia for $A1799
• this lens was designed to be used wide open or at f/2.0 when it is incredibly sharp in the centre with the lowest levels of CA, unlike the Panasonic Leica DG Summilux 25mm f/1.4 ASPH lenses which is a little soft wide open, especially in the corners, and it's sharpness is best at f/2.8-5.6
• now apparently discontinued and essentially replaced by the much smaller, less expensive, Micro Four Thirds system version, the Panasonic Leica DG Summilux 25mm f/1.4 ASPH lenses although this will not fit Four Thirds cameras

• 25mm focal length = 50mm field of view on 35mm full frame camera
• f/1.4 aperture
• aperture ring but only functions on Panasonic cameras not Olympus cameras
• 62mm filter thread non-rotating
• 10 elements in 9 groups inc. 1x aspherical, 1x Super-ED and 3x ED elements
• nice bokeh
• sharp wide open and sharpest at f/2.0
• close focus 0.38m
• 1.1EV vignetting; 0.5% barrel distortion
• 1.2px CA wide open increasing to 1.9px at f/5.6
• 75 x 78 mm
• 510g
• RRP $A1799 in 2009

• photozone.de review:
  • stunningly sharp in centre even wide open, peaking at f/2.0 which broke the resolution records for photozone.de!
  • edges are sharp at all apertures just not as incredibly sharp as the centre
  • 1.1EV vignetting at f/1.4
  • minimal barrel distortion (0.5%)
  • lateral CA increases as aperture is stopped down

• Flickr - my photo set
• Flickr - my photos of artworks in art galleries of Denmark
• Flickr - my photos of artworks in art galleries of New York and Philadelphia
• my Leica-D 25mm photos on JAlbum with some taken with the Olympus wide angle converter