Hektor 135mm f/4.5

Named after Max Berek's dog Hektor, the 135mm f/4.5 marked the practical telephoto limit of rangefinder focusing in the 1930s. Slow and long, it demanded steady hands and bright light, but it let Barnack-era photojournalists reach across streets and stadiums.

Today it is more curiosity than tool — but as the far end of the pre-war system, it belongs on the timeline. (Codeword HEKOU per collector literature; period catalogues vary.)