Voigtlander Double Shoe Adapter for light meter Type (C) (fits "I" type Leica and "S2" Nikon)

Double Shoe Adapter (C) fits Nikon "S2" and "I" type Leica VTSAC

There are three different dual-mounting adapters available. Each allows the meter to be used slightly offset on top of the camera with a viewfinder attached directly over the camera flash shoe.