Hello all,
here is the double cluster in Perseus imaged during the last "Nuit de l'Astronomie" in a local site "Champ du Feu" (alt 1100m), the 15th of last september
- Addition of 18x120s; préprocessing based with with offset (median of 9), "optimised dark" (median de 9), no flat.
- Imager: eos350d raw mode; 400iso.
- Astrographe: Takahashi Epsilon 160mm/f3.3
- Mount : em200Temma2jr
Processing with Iris 5.51: logarithm, color and saturation.
The focus was made with measuring the diffraction spikes generated with with a brighting star. Perhaps not the best method, although it helps
...
The mid size is here (1 Mo):
http://astrosurf.com/pierre/Ciel_pro...g-coul-ech.jpg
See the full size is here (5.5 Mo) , the one that i prefer :
http://astrosurf.com/pierre/Ciel_pro...k-log-coul.jpg
Clear skies.
Pierre.