Planetary nebula NGC 6751 in Aquila sketched by Dave Eicher using a 17.5-inch f/4.5 reflector at 71x.
To learn more about astronomical sketching, Astronomy magazine subscribers can access my Astronomy.com video "Sketching from the telescope" and read Glenn Chaple's Observing Basics column "Sketching 101."
See the rest of the Sketching at the telescope series.