Digital backs with electronic shutter (currently Rolling Shutter for Phase One IQ 3/4, Hasselblad X1D, and partly H6D) are becoming increasingly available. The new Rodenstock aperture unit - with its almost round, 9-piece aperture pattern - optimally supports this shutter type. Besides, photographers can use lens versions in short-barrel can also on the ALPA 12 FPS with its built-in focal-plane shutter (SB34, SB51, FPS SB17).