Abstract: A coupling device for a photographic apparatus, comprises a mount member having a base part secured to the photographic apparatus, a cylindrical part which extends from the base part and a projecting part. A bayonet mount member is also included in the coupling device which member includes a ceramic engaging member which is made of ceramic material and is placed on the projecting part and a claw part which is formed jointly by the projecting part and the ceramic engaging member. The claw part is arranged to engage the bayonet member of an accessory to be mounted on the photographing apparatus. Other embodiments of the coupling device which incorporate a mount member of ceramic material are described.