I recently acquired this lens as part of a darkroom package deal.
It is a 200 mm f/3.5 Rokuoh-sha Hexar Ser IIa.
Made by the company that was to become known as Konica it was apparently made during WWII for Japanese aerial cameras.
I couldn't find much on the net about it.
Does anyone have one of these or used one on a 4x5 camera?
It seems like a good candidate for use on a Speed Graphic if it could be attached to a lens board.
It would be a tight fit as it would require a 70 mm opening.
Any enlightenment would be much appreciated.
I am attaching a photo of the front of the lens.