Adapter · Praktica B to Fuji X adapter
A Praktica B lens was built to sit 44.4 mm from the film. A Fujifilm X camera's mount sits 17.7 mm from its sensor, so an adapter 26.70 mm deep puts the lens back where it was designed to be, and it focuses from close up to infinity with no glass in between.
Praktica B is a bayonet, so an M42 adapter won't take these lenses. Look for one sold for Praktica B, sometimes listed as PB. Prakticar lenses have three electrical contacts in the mount that send the set aperture to the camera, a system Pentacon called EDC. A plain adapter has no contacts, so the camera never sees the lens's aperture setting.
Search “Praktica B to Fuji X adapter” on eBay ↗eBay searchFujifilm X has no full-frame bodies. On a smaller sensor the frame is cropped, so each lens frames like a longer one. The f-number still sets exposure, while the depth of field looks like the larger number shown.
| Lens | On 35mm film | APS-C (1.5×) |
|---|---|---|
| Carl Zeiss Jena Prakticar 50mm f/1.8 | 50mm f/1.8 | 75mm f/2.7 |