Combination of 5, 1 minute exposures, SBIG ST-9E CCD.
16" f/10 schmidt-cassegrain with an f/6.3 focal reducer.
IC 4593 is a small but bright planetary nebula in southern Hercules, close to the border with Serpens. It is easily visible in an 8" telescope, however at least moderate magnification should be used in order to see its tiny disk.