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My advice is to whack the ISO up to max.
Horsehead is dim even for cooled CCDs. Unmodified it will be a struggle as it is largely Ha and the low pass Canon filter will be filtering that band out.
You caught it but its very noisy showing the low signal/noise ratio.
Same exposure time, scope and camera but modified would show a much brighter result. Consider the advantages of modifying your camera.
If you chose the clear optical glass option you can still use your camera for terrestial imaging using an XNite CC1 filter attached to the front of your lens.
Greg.
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