Rollei's interconnectable magazines are particularly recommended. They can easily be hooked into one another during projection and, in conjunction with the optional magazine track extension allow several magazines to be projected without interruption, one after the other.
This is of particular interest for professional purposes and where a larger number of slides are used in dissolve projection with a second projector. The Rollei interconnection magazines are available for 30 medium format slides under the name CM 77/30 and for 50 35mm slides under the name CM 55/50. The magazine track is open, so that corrections to the picture sequence can be made at any time during the presentation.