Venus Duo Track Camera Bellows for Canon FD Mount

This is a vintage Venus Duo Track camera bellows, probably from the 1960s or 1970s, made for a Canon film camera. The bellows are in great shape, with no damage. The box has wear, and an inner flap is taped. On bellows knob is a lock, the other is the focus, and you can push in the focus knob to quickly slide the bellows, then release for fine focus. The bellows have no holes, and they work well, and the two sample photographs of the back of an Indian head penny were taken with a vintage Canon 50mm f1.8 attached to the bellows, and attached to an EOS digital camera with an FD to EOS adapter. The 1.25x magnification photo (full frame shown) is with the bellows mostly retracted (about an 8cm working distance), and the roughly 2.8x magnification photo is with the bellows mostly extended, and with a working distance of around 5 cm. Magnification changes with the focal distance of the lens used.