Hi Captain, you've seen what you've seen... But I can't see it, going through the mere 5 rolls I've shot with the 'cron. Can't see it in the Biogon either. I was looking for wide-open examples under the assumption fall-off would be more apparent there. But for landscapes? Did your friend maybe have stacked filters (polarizer?) or something else that could vignette? Here's a landscapish example with at least some blue sky... See anything "severe"?
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