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As you can now see, my 'new' dark appears to be OK. (Feeling a little foolish now)
I could have sworn the lens cap was on when I was taking darks the other night. Obviously I did not have it on properly, and the light from my control room must have leaked into the front of the lens somehow, although, the band across the bottom is too even for it to be a 'chance' reflection.
Can't see how light could have gotten in via the viewfinder either, although that may have been more possible. If that was the case, then we shouldn't tolerate any background illumination while imaging.
Hence I'm confused, but also relieved that it does not appear to be the major issue I had originally thought.
I'm thankful that Bert covered the issue of mirror shadow. I guess the Tak FS-128 is designed more for visual use rather than imaging. And, as discussed, the issue got a lot worse when I attached the reducer.
Thanks again for your advice/assistance. I wonder what I can confuse myself with next?
Cheers,
Brian
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