Can HDR Efex Pro 2 be used on panorama images?
Yes, HDR Efex Pro 2 works well to create HDR panorama images. There are two possible methods. The first method is to use a software application such as PTGui to stitch together multiple panoramas, one for each image exposure captured, and then merge together the panoramas. This method typically will produce the best results.
An alternative approach is to merge each series together first to create an HDR of the series prior to stitching the images together. This ensures that the stitching process (along with any manual alignment) needs to be done only once.
To ensure uniformity of the final stitched result, create a custom preset within HDR Efex Pro 2 to use for each image series.