Black-eye galaxy

The skies do have a "black eye". And I have taken a snapshot of it. M64, in the constellation Coma Berenices. The "black eye" is quite obvious in this picture. Taken from one of our usual spots outside of Oslo. I tried a bit longer exposures this time around, using autoguider. Still haven't quite mastered the technique, and the guide-scope iced down, so PHD guider was struggling to follow the star properly, but it managed to keep the stars round'ish.
Tech details : Pentax K5, ISO 800, 45x2 min guided exposureTPO 6"RC w/APCCD67 reducer (f/6), Celestron Advanced VX.