Adobe today released a second release candidate for Lightroom 4.1.  This second  release candidate has been released to the public for broader testing and feedback in advance of an official Lightroom 4.1 release.

This release candidate fixes more bugs (on top of those fixed in the first release candidate), and adds support for several new cameras.  In addition, we have two nice new features:

• Support for 32-bit HDR TIFF files.  Now once you have merged multiple exposures using Photoshop’s HDR-Pro, you can do the tone mapping using Lightroom’s Develop module.  Note that 32-bit PSD’s are not supported, so be sure to save in Photoshop as a TIFF.
• New Lens Corrections tools for fixing purple and green fringing.  In the Lens Corrections panel, there is a new Color tab, with the Lightroom 4.0 Remove Chromatic Aberration checkbox, as well as the new purple and green controls. For automatic correction, click on the eye dropper and then click in the purple or green fringe in your photo (while zoomed in to 1:1 or greater), and Lightroom will detect and set the sliders appropriately to correct it.  Amount controls the strength of correction, and colors between the two Hue triangles are affected.

• New local purple/green defringe controls in the adjustment brush and graduated filters.

For a complete list of bug fixes and new cameras supported, see this Adobe post.

For an excellent article by Eric Chan of Adobe on purple and green fringing and how to fix it with the  new defringe controls, click here.