100% linear 32bit workflow, full EV range, 20k resolution. USE UNCOMPRESSED 32bit ORIGINAL FILE FOR THE BEST RESULT.
Tutorial on how to set nodes with JPG background panorama:
https://youtu.be/aj0LoQLjgYo
Camera background photos and color-graded JPG panorama:
https://drive.google.com/drive/folders/1jYOUsKcebvtc0VPRqEDdub2pxa04thHl?usp=sharing
18:00, Summer, sunny. Grassy field surrounded by suburban buildings.
Sun is unclipped, so in Cycles, you don't need any light source, other than this HDRI for realistic shadows.
Methodology:
7 expositions of the environment with 2 EV spacing (140 photos) + 7 expositions with 2 EV spacing of only the sun with ND1000 (10 stops) filter and ND1000 stacked with ND4000 filter (10+12=22 stops).