Novoflex Castel M - Sliding adjustment with focusing wheel. The continuously decreasing depth of field in image scales above 1:1 requires absolute attention to work. This is the only way to correctly select and maintain the distances between individual shots in a stack series. Success in using stacking software depends on this. The CASTEL-M features a screw that moves the moving part with exceptional precision, and for the first time has useful click stops for image scales 2:1; 3:1; 4:1 and 5:1. These are controlled via the rear focusing wheel and allow precise and repeatable click stops. From now on, a shot only needs to be taken with each click of the focusing wheel. The necessary feed speed and overlap of individual shots are determined by the individual steps. An additional advantage: the individual click stops are calculated in such a way as to minimize the occurrence of diffraction.