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Hi all, hoping someone can help me with this. I recently purchased a Metabones Speed Booster ULTRA so I could use my Sigma 18-35 f1.8 on my FS7... but annoyingly , despite updating the firmware on the metabones, there is still a noticeable vignette on the corners Of the image when you zoom out to 18mm. The set up works fine with my 24 -105 canon lens just not the sigma... any thoughts or experience for anyone with this?? any help appreciated