This was photographed before sunset in Capitol Reef National Park on my Olympus OM-D E-M1 MarkIII camera using Live Comp, which allowed me to get the cool long exposure effect in the clouds.
In order to do this long exposure I needed to use my NiSi 10 stop solid ND filter.
Using my M.Zuiko 8-25mm f4 pro lens at 10mm, I was shooting 2s exposures at f8 at ISO 200. I probably left the Live Comp running for somewhere between 5-10 minutes.
Here is a photo of my setup that evening.
Even if you don't use an Olympus camera, a 10 stop ND filter is a good filter to get long exposures around sunrise and sunset.
A 10 stop ND can prolong exposures for up to 5 minutes during golden hour with the appropriate settings.