Abstract: In a macrolens having a distance setting ring, which is rotatively supported on the lens mount, and a lens component sliding longitudinally therethrough along the lens axis, as well as a diaphragm drive, it is proposed that for the automatic and smooth stop setting in accordance with the distance setting, the diaphragm drive, mounted on the longitudinal sliding lens component, be connected by means of a diaphragm drive pin to a converter, which is placed on the lens mount and is formed, for example, by a guide slot extending angularly to the lens axis, to convert the longitudinal motion of the lens component into a rotational motion of the diaphragm drive pin.

Abstract: A macrolens assembly which has two distance setting rings which are coaxially arranged and are fitted into each other and each of which has on its radial exterior a distance scale. A control window is provided in the lens mount and in the outermost distance setting ring directly abutting there against in radial direction. The inner distance setting ring which can be rotated manually by means of a driving ring can be coupled to the outer distance setting ring by a driver formed as a ball catch. In this way, after one rotation of the driving ring, first the scale on the outer distance setting ring, when the scale on the inner distance setting, becomes visible.

Abstract: A mounting for a supply reel and a take-up reel in a camera, projector or other recording or reproducing apparatus comprises two coaxially juxtaposed mandrels of substantially the same diameter cantilevered for independent rotation on a common support. The outer mandrel carries one or more radially retractable detents whose withdrawal from a projecting position enables the take-up reel to be fitted onto the inner mandrel and which thereafter form a stop for the supply reel, thereby preventing the two reels from contacting each other. The withdrawal of the detents, or the removal of an abutment blocking such withdrawal, may be carried out as a separate operation; alternatively, withdrawal may be blocked automatically upon the emplacement of a reel on the inner mandrel.