On this trip, I was primarily testing the new EOS R3 with the Canon RF 600mm F4 L IS USM Lens. However, I had the lightweight, compact, inexpensive Canon RF 100-400mm F5.6-8 IS USM Lens on an EOS R5 readily available in a toploader case, handy to pull out when a wider need arose.
Each morning while heading to the favored deer photography locations, I passed an eastern overlook just before sunrise. A high mountain with no substantial mountains to the east that allows visibility of the sun at a very low angle is a great location to see colorful sunrise. Shenandoah National Park is one such location, and the percentage of photogenic sunrises here is quite high.
On this morning, I simply pulled over, set up the Really Right Stuff Ascend Tripod with the integrated head, mounted the RF 100-400 and R5, and took a few pictures before resuming the deer chase.
As illustrated here, the convenience and utility of the RF 100-400mm lens are very high. The long focal lengths can fill the frame with the color of even a compact sunrise show, and a wide aperture is not important in this case.
With the lens and in-body image stabilization, I could have handheld this shot, but strong winds made the tripod an easier choice for composition and steadiness reasons.