Nikon D300 User Manual page 289

1/3 step EV:
Shutter: 1/100, 1/125, 1/160, 1/200, 1/250, 1/320, etc.
Aperture: f/5.6, f/6.3, f/7.1, f/8, f/9, f/10, etc.
1/2 step EV:
Shutter: 1/90, 1/125, 1/180, 1/250, 1/350, 1/500, etc.
Aperture: f/5.6, f/6.7, f/8, f/9.5, f/11, f/13, etc.
1 step EV:
Shutter: 1/60, 1/125, 1/250, 1/500, 1/1000, 1/2000, etc.
Aperture: f/4, f/5.6, f/8, f/11, f/16, f/22, etc.
Bracketing
1/3 step EV: Bracket: 0.3, 0.7, 1.0 (or 1/3, 2/3, 1 EV steps)
1/2 step EV: Bracket: 0.5, 1.0 (or 1/2 and 1 EV steps)
1 step EV: Bracket: 1.0 (or 1 EV step)
Nikon chose to lump shutter speed, aperture, and bracketing
all under Custom setting
steps for exposure
b2. The factory default value for
cntrl. is 1/3 step.
289
EV