6x6 cm slides offer a dynamic color image that is countless times brighter and clearer than a mere 35mm slide. Hasselblad, Rollei, and other companies make slide projectors for this larger format. Gepe is not only the leader in glass mounts for 6x6 transparencies, they are really the only manufacturer that is available from all the major photo catalog stores. Since we are rather cheap, we store the slides back in the original boxes. The larger format of slide offered by Hasselblad format means that the slide lectures will be noticeably superior to anything possible with 35mm.
Audiences really appreciate the improvement.