Observation by James Screech: First deep sky LRGB M51

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James Screech


James Screech


2020 Apr 19 - 19:30


2020 Apr 20 - 15:59


The Whirlpool Galaxy (M51)

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Canes Venatici

Field centre

RA: 13h29m
Dec: +47°11'
Position angle: -9°57'

Field size

1°13' × 0°54'

  • ED70
  • Atik414ex
  • ZWO LRGB filters
  • AVX mount

3 min x 35 per filter



Target name



First deep sky LRGB M51

About this image

My first LRGB deep sky image. Atik 414ex, ZWO LRGB filters & ED70 (f6) telescope. Captured with APT, processed in DSS & PS. 35 x 3min subs in each filter, dark, bias and flat corrected.

I have done DSLR deep sky in the past (a few years ago) but not mono CCD & LRGB. Not great processing the brighter stars have a blue halo that could do with some work, but I'm pleased for a first attempt at processing. I'll spend some more time playing with it when I get the time. 

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