Thank you Pete and Rob for your comments. The size of the owl butterfly ranges from 65–200 mm (2.6–7.9 inches) - this one was in the 150mm (6 inch) range.
I was probably 12"-18" away (0.3 - 0.5 meters) away (maybe a bit closer). So long as I was not making a sudden move, the butterfly was content to model for me.