NGC 7000 The North America nebula

This patch of nebuosity lies in the constellation Cygnus the swan . I was using a ten inch F4.8 reflector , PHD auto guiding and an Atik 383L mono CCD camera . I captured ten minute sub frames and matching dark frames and combined them with flat field frames to reduce vignetting in the final image . The total exposure times was 60 minutes using a H Alpha filter , 30 minutes using an O111 filter and 10 minutes for each colour filter:
Narrowband luminance with RGB colour:

Narrowband plus RGB:

Bicolour:

The Leo triplet

The Leo Triplet . Commonly named the M66 group in the constellation of Leo the Lion . It lies at a distance of about 30 million light years . This image was taken using an Atik 383L mono CCD camera, PHD auto guiding and a 4 inch F7 refractor with a focal reducer making it F 6.3. I captured ten minute sub frames with matching dark frames and combined them making total exposure times of sixty minutes for each colour filter: