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Greg
I had this artefact in the first Proline camera FLI sold me which was a complete disaster in so many other ways, but that's another story. See the attached JPG.
While you have the cover off, you might also want to check the slop in the filter carousel, another trade-mark FLI design flaw. There was about 3mm slack in mine, and this causes visibile tilt and optical aberrations, particularly when your CFZ is measured in microns (about 60microns for a red filter I think). The unbelievable and utterly ridiculous advice from FLI was "take a link out of the chain"!!!!! The SBIG implementation is fantastic - you simply adjust the tension on the central spindle to the point where the carousel rotates smoothly, but there is no rock in it. Then there is the superb implementation of how they clamp the filters in position - no utterly stupid miniature screws (all of which are shiny in nature in the Proline, and all the source of reflections).
cheers
Martin
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