Abstract: A measuring camera has a camera housing fixed to a rigid frame providing a reference surface against which an objective lens unit is held so that for a plurality of such units, all can have their respective projection centrums located at a fixed position within the housing. The frame has guides on which a sensor, e.g. of the CCD type, is mounted for movement parallel to the optical axis without play.

Abstract: An anamorphotic attachment for a projection objective has front and rear lens groups which have vertical diameters greater than their horizontal diameters and received respectively in an inner mounting tube and an outer mounting tube, the latter being connectable to the projection objective at its rear end. The inner mounting tube is fully received in the outer mounting tube and has thereon a shifting screw for moving the inner mounting axially within the outer mounting and a clamping screw actuatable to lock the two mounting tubes together, both accessible at the front end of the inner mounting tube within the outer mounting tube.