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Hi Steve,
Just had a look in the Herald Bobroff and they go down to their "D" series of charts for this region. The small blue area in my image is within the area they have marked for IC 2118. They have nothing else marked in this area.
Comparing the star field with wide field images taken at similar apertures on IIS this blue feature is not part of those images.
This is pretty strange, early in the night while I was waiting for it to get dark enough, I took three 300 sec JPEG's, just to confirm that my alignment was right. The small blue feature shows up in each of them.
In the stack of 16 x 300 sec raw files this small blue feature really is not that much better defined.
Regards
Trevor
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