E2: Flash Shutter Speed; E3: Exposure Comp. For Flash - Nikon D7500 Menu Manual

e2: Flash Shutter Speed

This option determines the slowest shutter speed available
when using front- or rear-curtain sync or red-eye reduction in
mode P or A (regardless of the setting chosen, shutter speeds can
be as slow as 30 s in S and M modes or at flash settings of slow
sync, slow rear-curtain sync, or red-eye reduction with slow
sync).

e3: Exposure Comp. for Flash

Choose how the camera adjusts flash level when exposure
compensation is used.
Option
YE
Entire frame
E
Background only
104 Menu Guide
G button ➜ A Custom Settings menu
G button ➜ A Custom Settings menu
Both flash level and exposure compensation are
adjusted to modify exposure over the entire
frame.
Exposure compensation applies to background
only.
Description