I'm being driven crazy by what I assume is mechanical vignetting with my 90/6.8 Caltar II-N (grandagon) using a B+W 72mm non-slimline polarizer and 67>72 step-up ring when using moderate swing. Would a 67 slimline help, or am I just running out of coverage? The dark corners are pretty sharp in cut-off. Thanks,
-j
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