Open cluster, constellation of Puppis, distant from 3,300 light years, with size of 44.7 x 29.8 arcmin and ratio of 0.448 deg. More than the FOV of my system.
Because of the good visibility and transparence of the sky I did two different processes to show the cluster itself and the cluster together others background stars.
http://jsmastronomy.30143.n7.nabble....ter-td387.html
GSO 305 mm - Canon T3 - 2 x 300 seg - ISO 800 - OAG - UHC filter - Coma corrector
note: despite of good quality of the sky, the photos have much noise in the spectrum of Hydrogen alfa
File very large to IIS :
http://astronomia-e-astrofotos.10697...9-fullstar.jpg