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It appears that it is F5, but there are 31mm filters and wheel that might do it:
"Optional 31mm CFW allows unvignetted images to f/3. Works at f/2 with a Hyperstar."
I found an owner of both, I've emailed him to get details on how much it vignettes and how much can be processed out.
If I have any more questions I'll PM you and stop clogging your ad thread!
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