Spiratone Bellowscope set.
Shown with the 150mm T mount lens mounted.
35mm Flat Field T mount threaded lens is to the right.
Minolta MC/MD bayonet adapter in front takes the place of the T mount adapter and allows use of Minolta lenses.
This one has a custom T mount on the camera side to allow use on a Maxxum 7D digital SLR.
150mm lens shown mounted will focus from 1:1 to infinity as a "short mount" lens.