Celestial hemisphere:  Northern  ·  Constellation: Canes Venatici (CVn)  ·  Contains:  IC 4277  ·  IC 4278  ·  M 51  ·  NGC 5194  ·  NGC 5195  ·  Whirlpool Galaxy
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M51 (1.8 hr exposure with Nikon 163mm diameter F5.6 lens and FS Canon 60D), Rick Evans
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M51 (1.8 hr exposure with Nikon 163mm diameter F5.6 lens and FS Canon 60D)

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Description

I've become a little better at post-processing and decided to re-process an image of M51 from March taken in very cold weather with a big telephoto lens and a modded DSLR.  I think the cold helped keep the noise down a bit.  The lens is pretty old and is basically an ED doublet with some additional corrective lenses that flatten the field.  Almost like a poor man's Petzval except that when it was new this lens wasn't cheap.

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M51 (1.8 hr exposure with Nikon 163mm diameter F5.6 lens and FS Canon 60D), Rick Evans