Camera Lens Mount Adapter This Works Great Does Anyone Use Nikon Or Canon Camera With M42 Adaptor To Make Full Use Of M42 Lens Mount?

Does anyone use Nikon or Canon camera with M42 Adaptor to make full use of M42 lens mount? - camera lens mount adapter this works great

Hello
In looking to buy or Nikon D90 or Canon EOS 500D Rebel T1i but have different Praktica (M42) found lenses.I that some increases were made M42 Adapter for Nikon and Canon, but Im not sure if it works (on the infinite ). Thanks