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Hello Ian,
As per Zero's comment: more info would help-
1. Post the image/s with the extraneous light,
2. Is it DSLR or astrocam? (model?)
3. If a DSLR was used, was the optical viewfinder covered during exposure? Sometimes a light leak is possible around the mirror.
4. Lastly and most importantly - Is there anything you do that changes the nature of the extraneous light on the image, or is it always in the same location, despite changes perhaps to ambient light, camera position, portrait or landscape orientation, different lens or scope, etc...?
Best
JA
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