Aurora HDR 2017 is a great program which uses both layers and masking to post-process your pics. In many cases is a cut above photoshop but lacks some of the selection tools. Most photographers I know use it in place of photoshop as it is easier to use and contains many tools better than photoshop and is on sale right now for 89.00 and is yours to use for as long as you want, no subscription. This program works equally well with multiple exposure pics and single exposure pics.
Aurora HDR 2017 is a Lightroom plug-in but can also be used as a standalone program
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