Nikon body + Praktica PB lens
Unfortunately the flange focal depth doesn't allow conversion.
Unfortunately there seem to be no lens adapters, therefore the flange focal depth (46.5 mm) of the Nikon F body prohibits mounting a PB lens (44.4 mm).The flange focal depth of the Praktica B bayonet lock system which was introduced in 1978 (bayonet or PB mount) is often specified 44mm incorrectly, while it's actually 44.4mm.
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