M51, the Whirlpool galaxy and its neighbor NGC 5195 are surrounded by a wide expanse of sky that can appear empty of other galaxies but look again and you will see they are not alone. See the labled inverted image next for guidance.
Details
2011-04-22 at the Victoria Centre Observatory.
127mm TV with modified Canon T1i camera on Paramount ME.
Exposure, 7-2 min plus 5-8 min guided exposures with 6-8 min darks and 8-flats for calibration.
Processing in Images Plus and Photoshop.