The Leitz 135mm f/2.8 Hektor Visoflex is a medium telephoto lens designed for use with the Visoflex reflex housing on Leica rangefinder cameras, extending the system into a focal length the coupled rangefinder mechanism alone cannot focus accurately. It belongs to the screw-mount Visoflex family and is mechanically distinct from the direct-bayonet M telephotos of the same era.

Hammer prices for this Hektor are thin on the ground in the UK auction market — the two records on file run from £48 in 2005 to £260 in 2012, both wholesale saleroom results that exclude buyer's and seller's commission. As of 2026 a clean copy sells for a price in the lower-to-middle hundreds rather than the thousands commanded by faster Leitz glass, and the limited data means today's worth swings sharply with optical condition and completeness of the Visoflex mounting hardware.