[tornado33]

Hi all
This Chrsitmas Eve, the sky cleared but was hazy and very bright. Even with the Ha filter the raw images had a very bright (red) background, certainly not dark, not even the &nm filter could not stop that much light pollution.

Horsehead area. Meade 6 inch F3.6 Cometracker Schmidt Newtonian.
7x10 mins ISO800. Baader MPCC and 7Nm Ha filter. Modded 350D camera
Processed in Iris and Photoshop. Only red channel used after aligning and stacking.

Have a go at how much light pollution and noise there was in each sub. This is a full res. crop of a individual shot right over the horsehead itself.
Merry Christmas all
Scott