Hallo,
es handelt sich um einen Adapter, der mit den Cosina CSM und CS-1-Kameras Zeitautomatik ermöglichen soll.
Auf der Seite
http://camera-wiki.org/wiki/Cosina_CSM findet sich folgende Erklärung :
The CSM and the
CS-1 are among the models that can accept a quirky accessory called the
Cosina AEC adapter which adds aperture-preferred automatic exposure mode, mounting onto the hot shoe and connecting to the "A" terminal above the regular PC socket. This attachment is able to twist the shutter speed dial using its own battery-powered motor.
LG Volker