About shutter speeds

On the ealier model, shutter speeds are :

B, 1, 2, 5, 10, 25, 50, 100, 250, 500, 1000sec.

On the later model, shutter speeds are :

B, 1, 2, 4, 8, 15, 30, 60, 125, 250, 500, 1000sec.

*In the figure above is the earlier model.