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1) H-Alfa
2) Narrow Band - Ha.S2HaO3
Rifrattore NightTechnology ED 80/500 f/6.25
Sbig ST2000XM
Set filtri narrow Baader Planetarium
Base colore
SII (R) 4x20min. bin 2x2
Ha (G) 3x20min. bin 1x1
OIII(B) 3x20min. bin 2x2
Luminanza
Ha (L) 9x20min. bin 1x1
http://it.wikipedia.org/wiki/Nebulosa_Nord_America
2) Narrow Band - Ha.S2HaO3
Rifrattore NightTechnology ED 80/500 f/6.25
Sbig ST2000XM
Set filtri narrow Baader Planetarium
Base colore
SII (R) 4x20min. bin 2x2
Ha (G) 3x20min. bin 1x1
OIII(B) 3x20min. bin 2x2
Luminanza
Ha (L) 9x20min. bin 1x1
http://it.wikipedia.org/wiki/Nebulosa_Nord_America