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I have idea as to what has caused that line.
Could it be processing artifacts from over shapening?
This picture is no where near as good as the other pics on your web page.
The horsehead is a terrible target to try & image except from a dark site.
A one shot colour camera will make it even harder as the
best pics of this always include Ha filter sub-frames taken with a mono.
better luck next time.
cheers
Allan
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