Adobe Photoshop Lightroom 4.4 Release Candidate |  Adobe Labs | Best Quality Mirrorless Cameras |

Lightroom 4.4 Release Candidate includes a correction to the demosaic algorithms for Fujifilm cameras with the X-Trans sensor. 

This specifically impacts the following cameras:

    Fujifilm X-Pro1
    Fujifilm X-E1
    Fujifilm X100S
    Fujifilm X20

New Camera Support

The following new cameras are now supported:

    Canon EOS 1D C
    Casio Exilim EX-ZR700
    Fujifilm X100s
    Fujifilm X20
    Hasselblad Lunar
    Leica M
    Nikon 1 V3
    Nikon 1 S1
    Pentax MX-1

New Lens Profile Support
Canon 24-70 f/4L IS                       
Sigma 18-250mm F3.5-6.3 DC MACRO HSM       
Sigma APO MACRO 180mm F2.8 EX DG OS HSM   
Sigma 35mm F1.4 DG HSM A012          
Sigma 17-70mm F2.8-4 DC MACRO OS HSM C013

Fixed Issues

The following issues have been fixed in Lightroom 4.4 release candidate:

The crop overlay tool resized incorrectly when used in conjunction with the “Constrain to Crop” checkbox in the Lens Correction panel
Background graphics were not correctly rendered within the Book Module
The supplied lens profile for the Sony RX-1 did not contain vignette information
Previews of photos in portrait orientation were blurry when viewed in the filmstrip in the Develop module. (Mac only)
Stack badges displayed the wrong count when creating new stack that included a preexisting stack.
The Filter scrollbar within the Library module was not rendering properly.

Via Thomas Menk