So off I went last evening, arriving at the west-central Ohio locale shortly before dusk. Moth pollinators are often crepuscular, visiting flowers at dusk or soon after. See THIS POST for an example of a similar hunt in which I met with success.
The photo above shows my camera rig, set up and ready to fire and affixed to my Gitzo tripod. It is pointed and focused on the orchids, which are near the base of the trees. It's a Canon R5 mated to a Canon 400mm f/2.8 II lens, coupled to a 50mm extension tube. That gets the minimum focus down to about six feet. A Canon 600 speedlite provides illumination, and it's equipped with a Better Beamer flash extender. That unit's fresnel lens magnifies the flash output, allowing light to be thrown further - a necessity when shooting fast shutter speeds in high-speed sync mode. Settings were 1/1000, f/8, and ISO 1000, which gave a good exposure in very dark conditions.
Conditions were perfect: absolutely no wind, warm, and humid. As evidence of the stillness, I made the above shot without flash - it was nearly dark - at f/18, ISO 200, and a whopping 13 second exposure. Try that with even the slightest breeze. I generally do not care for the look of flash on flowers. It can impart a harshness not in keeping with the subject's qualities. But when shooting fast-moving moths at flowers, in the dark, flash is essential.
What I would have given to have had a moth in a shot with the orchid. Alas, it was not to be.