The 260mm Nikkor f10 will cover. Blindingly knife sharp to the corners. Only f32 though. Probably the sharpest lens I've ever seen and no center filter needed. Also you just cant beat an older uncoated 12" Dagor f6.8. The more I try other ULF lenses the more the Dagor shines. This has my vote for the best ULF lens ever made.
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