New use for old lenses has been found by video cameras like the Panasonic AF-100. But for those of us with DSLRs, I designed a simple adapter for these old cheap, powerful lenses.
Many older lenses can’t simply be attached to DSLRs like my D7000 because the flange focal distance (lens mount to the focused image) is too short. DSLRs have a mirror, which gets in the way and makes the FFD almost 3 times as long.
My solution is to attach another lens to focus on where the sensor would be for the primary lens. To minimize length, I turned the secondary lens into a macro (close-focusing) lens by mounting it backwards.