I bought a Super Cosina Macro lens 75-300mm at a yard sale (didn't have my camera on hand to test the fit), & I've searched ebay for adapters that might allow the lens to be mounted to my Nikon d40. Minimal knowledge when it comes to adapters & mounting other lens brands.
Read more: Adapter for Nikon d40 to mount a Cosina 75-300mm Macro lens?