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Messier 51 ("Whirlpool")


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About this observation
Les Dickens
Time of observation
14/05/2018 - 01:00
NGC 5194 (M51)
Observing location
Cheltenham, Glos.
200mm F6 Newtonian
QHY9s mono camera
Processed with IRIS software
60x70s (luminance); 15x70s (S-II); 15x70s (O-III); 15x70s (H-α)
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F6 Newtonian telescope + QHY9S mono camera.

A first attempt at using LRGB techniques.  Luminance 60x70s and 15x70s each of S-II (red), O-III (green) and H-β (blue).  Relatively successful, but I was almost caught out by not realising the need to refocus the telescope when switching to the narrow band filters.  I found it quite difficult to get good focus given the faintness of the filtered images .

All images processed using IRIS software.

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