Abstract: An arrangement for transferring photosensitive materials from cassettes of different types and configurations into the interior of a handling machine, such as a developing machine, includes an external wall of the machine which is provided with an input slot, and a plurality of support members which are interchangeably mountable, in a light-sealing manner, at a region of the external wall which surrounds the input slot. Each of the support members is provided with a through opening which registers with the input slot in the mounted position of the respective support member. Each of the support members has a receiving side which is configurated compatibly with a portion of a cassette of a certain type so that the latter portion can be introduced into the receiving side of its associated support member and establish a light-sealing contact therewith. Holding members may be provided on the support member which cooperate with compatible portions of the cassette to hold the latter on the support member.