About image
NGC 1491 is an emission nebula in the Perseus constellation, with dimensions of 9'x6 '.
It 'sa relatively bright object, already visible with poses ccd of a few seconds even in my tele C9.25 HD at f / 10.
Near the nebula extends a whole area of much weaker nebular emission.
The image is a Ha / OIII composition obtained with the Cannistra method (R = Ha, B = OIII, G = Ha + OIII).
This is the first work obtained with the Active Optics of the Starlight Xpress on the glorious Losmandy G11 (a bit in trouble to chase the focal length of C9.25)