light years in the constellation of Lyra. However the nearby barred spiral galaxy IC1296
lies at a distance of about 221 million light years. The image was taken unguided, using a
ten inch, f/4.8 reflector. 60s sub-frames and matching dark frames were captured, making
total exposure times of 30 minutes for each RGB colour filter:
NGC 7000 . The Wall of the North America Nebula . This bi-colour image is using oxygen for
blue and orange for hydrogen. The technique reveals the chemistry of the nebula and is
called mapped colour imaging. A four inch refractor with PHD auto guiding was used. 10
minute sub-frames with matching dark frames were used, making total exposure times of
ninety minutes for each narrowband filter (Olll and H-alpha):
