Release Notes: The lensfun library for reading and writing lens parameters from/to a database was integrated. A new "pto_gen" tool for the generation of pto files from image files was added. Various improvements were made to "cpfind". An option to keep exposure fused stacks was added. "pano_modify" gained an HDR autocrop option. There were many other improvements and bugfixes.
Release Notes: A vertical feature detection tool for automatic leveling of panoramas was added. The Fast Preview window can now show composition guides such as Rule of Thirds and Golden ratio. The output of High Dynamic Range (HDR) images was modified to prevent clipping of the exposure in EXR format images. The batch processor PTBatcherGUI was extended. Many more improvements and bugfixes were made.