Praktica B mount adapter
The Praktica B mount (also called PB-mount) is a bajonett mount that was introduced in 1978. Used with the Praktica B electronic SLR manufactured by VEB Pentacon in East Germany. Praktica B mount lenses are not identical to M42 lenses but very similar and you can purchase them for a fraction of the price. Brands manufacturing Praktica B mount lenses are Carl Zeiss, Beroflex, Meyer-Optik Görlitz, Pentacon and Prakticar. Although the Prakticar lenses are often not branded the classical way (e.g.: often they are not branded as Sonnar or Pancolar lenses) they do have the same optical performance.
Praktica B mount adapter for Micro 4/3, Canon EOS and Sony NEX (Sony Alpha)
There are a lot of adaptors available – below you find a link to each camera brand:
Praktica B to Canon EOS adapter
Mounting an Praktica B lens to Canon EOS is unproblematic. It will allow you to focus to infinity. Of course, focusing and aperture settings are done manually. I would recommend that you get an adaptor such as below:
Praktica B to Micro 4/3 (micro-four-thirds, mft) adapter (Panasonic G, Olympus Pen)
Connectivity to micro-four-thirds is unproblematic. The adapter is always quiet large which will increase the “size” of your lens. Focusing to infinity works fine. The only major drawback is that the images are cropped compared a full frame SLR. Even a 35 or 50 prime lens will feel like a telephoto. You can find the adapters here:
Praktica B to Sony E-Mount (NEX / Sony Alpha)
With infinity focus.