The Leo Triplet: galaxies NGC3628, M66, and M65
This is an improvement on a previous image. I accidentally left the ISO setting on 1600 after focussing on a dim star - the result was noisier than I would like but gratifyingly bright. However, due to high ISO and perhaps some loss of dynamic range, the cores of M66 and M65 were overexposed, so I borrowed them from an older image acquired with lower ISO and shorter exposure time.