You need a mirror, E.
Originally Posted by E. von Hoegh
These devices are merely reverse teleconverters and can produce as much resolution as a modern small digital sensor (about 4um), with which they are intended to be used. There's nothing magic or bullshit, they don't need to be designed in conjunction with any particular lens: is your film designed with your lens in mind? It just takes the focused image and shrinks it by 1.5x linearly, which gives exactly the same effect as a one-stop shorter+faster lens with less coverage. The recorded image on APS will be identical to the recorded image on 135.
Just because you don't understand it doesn't make it wrong.