B-band images of the four old open clusters: (a) Czerinik 30, (b) Berkeley 34, (c) Berkeley75, and (d) Berkeley 76. North is up, and east is to the left. The red cross symbols are the centers of the clusters, red circles show the scope of the clusters with the radii determined in this study. The radius for each cluster is shown in Table 2. Other X symbols indicate the centers of the clusters from previous studies (see the text for details).