This image was shot in Sand Dunes National Park, Colorado.  It was shot around 7 PM in September as sun was starting to set.  Camera was a tripod mounted Canon 7D Mark II, with a 18-135mm zoom set to 67mm,  Exposure mode was Manual.  Setting were f/5,6, ISO-400, 1/3200 second.   This was the nominal setting for a 5 shot HDR.  The  additional shots were -2, -1, +1, +2 f/stops.  Shots were combined, edited and merged to HDR in Lightroom Classic 2021, with final editing and sky replacement in Photoshop CC.