I believe I'm getting internal bellows reflections. My photocopy stand is not setup right now, but I'll post some examples shortly.
I wonder if others that had this issue and solved it could chime in.
I do have a bag bellows that may focus with my 300mm lens. I don't have a compendium shade. I use the darkslide to shade the lens. But the pictures in question seemed to cause the internal reflections from a big semi-overcast sky. Perhaps I need to be more diligent to in these cases (where the sun is not actually hitting the lens) and still shade the lens with the darkslide from above.
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