Ffordes currently lists a Tominon 50/4.5 lens as an enlarging lens

http://www.ffordes.com/product/18020810195881

however, the lens was designed by Tomioka as a reprographic / macro lens for use with the Polaroid MP-4 repro cameras. The Tomioka factory was acquired by Kyocera and it's where the high end Contax lenses were made.

Tomioka lenses have an excellent reputation and this example would be ideal for close-up photograohy up to about 3x magnification provided you're prepared to set it up on a bellows or extension tubes and focus manually or use it 'as is ' with an adapter, with any DSLR or mirrorless ICL camera.

Much cheaper than buying a marque macro lens and will likely enable just as good if not better results than an expensive AF macro optic.

dunk