I have one of these Rukuoh-sha Tokyo 250mm lenses in barrel. While I'm aware of Konica's reputation for the Hexanon lenses, I haven't found any information about this lens (or this series of lenses). It most certainly is a lens intended for LF use, about 1.5 lbs and the rear element is just short of 3" across. I briefly gave some thought to this being a repro lens, but while the barrel has an odd configuration for the rear element mounting, the aperture range (4.5 to 32) would seem to remove it from the "norm" of copy lenses. Has a sort of bayonet mount (3 studs on lens and turning cam slots on the filter) filter of orange yellow (or yellow orange) glass, marked "Rukuo-sha Colour Filter". Any info would be appreciated.
Ed
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