This Island Universe
The Whirlpool Nebula in Canes Venatici (M51)
and Supernova 2005cs

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Composite image:

Takahashi Mewlon 300 (f/9), SBIG ST-10XME, CFW8a and AO-7 (galaxy pair)
300 minutes Luminance, 120 minutes Red, Green, Blue (each)

RCOS 20-inch (f/8), SBIG STL-11000XM (background)
225 minutes Luminance, 45 minutes Red, 36 minutes Green, 54 minutes Blue