This was taken with a Nikon D850 and Sigma 14mm f1.8 lens. I shot the canyon image about 30 minutes after the sun had set, then left the camera in the same position for 2 hours until the sky darkened and the milky way appeared. I opened up the aperture and took the sky image capturing the night sky. Once the sky goes dark, the canyon becomes a black hole and is nearly impossible to get any detail of the canyon or waterfall, without painting in light from an external source. That method works, but does not look as natural due to shadows formed by painting in the light.
Palouse Falls in Eastern Washington under the milky way