M27 - the Dumbell or Apple Core nebula

Taken during a collimation session on the ODK12 on the the 6th of July 2015. I felt I'd gone as far as the conditions and eyepieces allowed on that session, and spent half an hour taking this photograph to see the result of collimation by eyepiece, on a photograph.
The camera was my Canon 550D set at ISO800. 20 frames of 60sec each, no guiding, no darks and no flats. Nor did I use my usual IDAS filter. I Sigma-added the frames in groups of 5, then averaged the 4 groups, so the result had the equivalent of 5 mins of depth. The frames were pre-processed and stacked in Astroart then finally processed in Photoshop.