Sony DSLR-A700H User’s Guide - Custom Button; Exposure Step

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For details on the operation 1 page 32
You can assign a function to the C (Custom) button.
You can select a 0.5 or 0.3 compensation increment for shutter speed, aperture, and exposure.
Custom button
AF lock
For details, see page 81.
AF/MF control
D.O.F.preview
ISO
White balance
Exposure comp.
Flash compens.
Drive mode
AF area
Image size
Quality
Creative Style
D-RangeOptimizer
Flash mode
Memory
Exposure step
0.5 EV
Changes in 1/2 EV steps
0.3 EV
Changes in 1/3 EV steps